regluit/payment/manager.py

from regluit.core.models import Campaign, Wishlist
from regluit.payment.models import Transaction, Receiver, PaymentResponse
from django.contrib.auth.models import User
from django.core.urlresolvers import reverse
from django.conf import settings
from regluit.payment.parameters import *
from regluit.payment.paypal import IPN_SENDER_STATUS_COMPLETED
from regluit.payment.signals import transaction_charged

if settings.PAYMENT_PROCESSOR == 'paypal':
    from regluit.payment.paypal import Pay, Finish, Preapproval, ProcessIPN, CancelPreapproval, PaymentDetails, PreapprovalDetails, RefundPayment
    from regluit.payment.paypal import Pay as Execute
    
elif settings.PAYMENT_PROCESSOR == 'amazon':
    from regluit.payment.amazon import Pay, Execute, Finish, Preapproval, ProcessIPN, CancelPreapproval, PaymentDetails, PreapprovalDetails, RefundPayment
import uuid
import traceback
from regluit.utils.localdatetime import now
from dateutil.relativedelta import relativedelta
import logging
from decimal import Decimal as D
from xml.dom import minidom
import urllib, urlparse

from django.conf import settings

logger = logging.getLogger(__name__)

def append_element(doc, parent, name, text):
    
    element = doc.createElement(name)
    parent.appendChild(element)
    text_node = doc.createTextNode(text)
    element.appendChild(text_node)
    
    return element

# at this point, there is no internal context and therefore, the methods of PaymentManager can be recast into static methods
class PaymentManager( object ): 
    
    def __init__( self, embedded=False):
        self.embedded = embedded
        
    def processIPN(self, request, module):
        
        # Forward to our payment processor
        mod = __import__("regluit.payment." + module, fromlist=[str(module)])
        method = getattr(mod, "ProcessIPN")
        return method(request)

    def update_preapproval(self, transaction):
        """Update a transaction to hold the data from a PreapprovalDetails on that transaction"""
        t = transaction
        method = getattr(transaction.get_payment_class(), "PreapprovalDetails")
        p = method(t)
                    
        preapproval_status = {'id':t.id, 'key':t.preapproval_key}
        
        if p.error() or not p.success():
            logger.info("Error retrieving preapproval details for transaction %d" % t.id)
            preapproval_status["error"] = "An error occurred while verifying this transaction, see server logs for details"
        else:
            
            # Check the transaction status
            if t.status != p.status:
                preapproval_status["status"] = {'ours':t.status, 'theirs':p.status}
                t.status = p.status
                t.local_status = p.local_status
                t.save()
                
            # check the currency code
            if t.currency != p.currency:
                preapproval_status["currency"] = {'ours':t.currency, 'theirs':p.currency}
                t.currency = p.currency
                t.save()
                
            # Check the amount
            if t.max_amount != D(p.amount):
                preapproval_status["amount"] = {'ours':t.max_amount, 'theirs':p.amount}
                t.max_amount = p.amount
                t.save()
                
            # Check approved
            if t.approved != p.approved:
                preapproval_status["approved"] = {'ours':t.approved, 'theirs':p.approved}
                t.approved = p.approved
                t.save()
                
            # In amazon FPS, we may not have a pay_key via the return URL, update here
            try:
                if t.pay_key != p.pay_key:
                    preapproval_status['pay_key'] = {'ours':t.pay_key, 'theirs':p.pay_key}
                    t.pay_key = p.pay_key
                    t.save()
            except:
                # No problem, p.pay_key is not defined for paypal function
                blah = "blah"
            
        
        return preapproval_status            

    def update_payment(self, transaction):
        """Update a transaction to hold the data from a PaymentDetails on that transaction"""
        t = transaction
        payment_status = {'id':t.id}
            
        method = getattr(transaction.get_payment_class(), "PaymentDetails")
        p = method(t)
        
        if p.error() or not p.success():
            logger.info("Error retrieving payment details for transaction %d" % t.id)
            payment_status['error'] = "An error occurred while verifying this transaction, see server logs for details"
        else:
            
            # Check the transaction status
            if t.status != p.status:
                payment_status['status'] = {'ours': t.status, 'theirs': p.status}
                
                t.status = p.status
                t.local_status = p.local_status
                t.save()
                
            receivers_status = []
            
            for r in p.transactions:
                # This is only supported for paypal at this time
                try:
                    receiver = Receiver.objects.get(transaction=t, email=r['email'])
                    
                    receiver_status = {'email':r['email']}
                    
                    logger.info(r)
                    logger.info(receiver)
                    
                    # Check for updates on each receiver's status.  Note that unprocessed delayed chained payments
                    # will not have a status code or txn id code
                    if receiver.status != r['status']:
                        receiver_status['status'] = {'ours': receiver.status, 'theirs': r['status']}
                        receiver.status = r['status']
                        receiver.save()
                        
                    if receiver.txn_id != r['txn_id']:
                        receiver_status['txn_id'] = {'ours':receiver.txn_id, 'theirs':r['txn_id']}
                        
                        receiver.txn_id = r['txn_id']
                        receiver.save()
                        
                except:
                    traceback.print_exc()
                    
                if not set(["status","txn_id"]).isdisjoint(receiver_status.keys()):   
                    receivers_status.append(receiver_status)
            
            if len(receivers_status):
                payment_status["receivers"] = receivers_status
                
        return payment_status

    
    def checkStatus(self, past_days=None, transactions=None):
        
        '''
        Run through all pay transactions and verify that their current status is as we think.
        
        Allow for a list of transactions to be passed in or for the method to check on all transactions within the
        given past_days
        
        '''
        
        DEFAULT_DAYS_TO_CHECK = 3
        
        status = {'payments':[], 'preapprovals':[]}
        
        # look at all PAY transactions for stated number of past days; if past_days is not int, get all Transaction
        # only PAY transactions have date_payment not None
        
        if transactions is None:
            
            if past_days is None:
                past_days = DEFAULT_DAYS_TO_CHECK
        
            try:
                ref_date = now() - relativedelta(days=int(past_days))
                payment_transactions = Transaction.objects.filter(date_payment__gte=ref_date)
            except:
                ref_date = now()
                payment_transactions = Transaction.objects.filter(date_payment__isnull=False)
                
            logger.info(payment_transactions)
            
            # Now look for preapprovals that have not been paid and check on their status
            preapproval_transactions = Transaction.objects.filter(date_authorized__gte=ref_date, date_payment=None, type=PAYMENT_TYPE_AUTHORIZATION)
    
            logger.info(preapproval_transactions)
            
            transactions = payment_transactions | preapproval_transactions
 
        
        for t in transactions:
            
            if t.date_payment is None:
                preapproval_status = self.update_preapproval(t)
                logger.info("transaction: {0}, preapproval_status: {1}".format(t, preapproval_status))
                if not set(['status', 'currency', 'amount', 'approved']).isdisjoint(set(preapproval_status.keys())):
                    status["preapprovals"].append(preapproval_status)
            else:
                payment_status = self.update_payment(t)
                if not set(["status", "receivers"]).isdisjoint(payment_status.keys()):
                    status["payments"].append(payment_status)
            
        return status
    
         
    def run_query(self, transaction_list, summary, pledged, authorized, incomplete, completed):
        '''
        Generic query handler for returning summary and transaction info,  see query_user, query_list and query_campaign
        '''

        if pledged:
            pledged_list = transaction_list.filter(type=PAYMENT_TYPE_INSTANT,
                                                   status=TRANSACTION_STATUS_COMPLETE)
        else:
            pledged_list = []
        
        if authorized:
            # return only ACTIVE transactions with approved=True
            authorized_list = transaction_list.filter(type=PAYMENT_TYPE_AUTHORIZATION,
                                                         status=TRANSACTION_STATUS_ACTIVE,
                                                         approved=True)
        else:
            authorized_list = []
            
        if incomplete:
            incomplete_list = transaction_list.filter(type=PAYMENT_TYPE_AUTHORIZATION,
                                                         status=TRANSACTION_STATUS_INCOMPLETE)
        else:
            incomplete_list = []                      
            
        if completed:
            completed_list = transaction_list.filter(type=PAYMENT_TYPE_AUTHORIZATION,
                                                         status=TRANSACTION_STATUS_COMPLETE)
        else:
            completed_list = []            
        
        if summary:
            pledged_amount = D('0.00')
            authorized_amount = D('0.00')
            incomplete_amount = D('0.00')
            completed_amount = D('0.00')
            
            for t in pledged_list:
                for r in t.receiver_set.all():
                    #
                    # Currently receivers are only used for paypal, so keep the paypal status code here
                    #
                    if r.status == IPN_SENDER_STATUS_COMPLETED:
                        # or IPN_SENDER_STATUS_COMPLETED
                        # individual senders may not have been paid due to errors, and disputes/chargebacks only appear here
                        pledged_amount += r.amount
                
            for t in authorized_list:
                authorized_amount += t.amount
                
            for t in incomplete_list:
                incomplete_amount += t.amount
                
            for t in completed_list:
                completed_amount += t.amount                
                
            amount = pledged_amount + authorized_amount + incomplete_amount + completed_amount
            return amount
        
        else:
            return pledged_list | authorized_list | incomplete_list | completed_list   

    def query_user(self, user, summary=False, pledged=True, authorized=True, incomplete=True, completed=True):
        '''
        query_user
        
        Returns either an amount or list of transactions for a user
        
        summary: if true, return a float of the total, if false, return a list of transactions
        pledged: include amounts pledged
        authorized: include amounts pre-authorized
        incomplete: include amounts for transactions with INCOMPLETE status
        completed: include amounts for transactions that are COMPLETED
        
        return value: either a float summary or a list of transactions
        
        '''        
        
        transactions = Transaction.objects.filter(user=user)
        return self.run_query(transactions, summary, pledged, authorized, incomplete=True, completed=True)
       
    def query_campaign(self, campaign, summary=False, pledged=True, authorized=True, incomplete=True, completed=True):
        '''
        query_campaign
        
        Returns either an amount or list of transactions for a campaign
        
        summary: if true, return a float of the total, if false, return a list of transactions
        pledged: include amounts pledged
        authorized: include amounts pre-authorized
        incomplete: include amounts for transactions with INCOMPLETE status
        completed: includes payments that have been completed
        
        return value: either a float summary or a list of transactions
        
        '''        
        
        transactions = Transaction.objects.filter(campaign=campaign)
        return self.run_query(transactions, summary, pledged, authorized, incomplete, completed)
    

    def query_list(self, list, summary=False, pledged=True, authorized=True, incomplete=True, completed=True):
        '''
        query_list
        
        Returns either an amount or list of transactions for a list
        
        summary: if true, return a float of the total, if false, return a list of transactions
        pledged: include amounts pledged
        authorized: include amounts pre-authorized
        incomplete: include amounts for transactions with INCOMPLETE status
        completed: includes payments that have been completed
        
        return value: either a float summary or a list of transactions
        
        '''        
        
        transactions = Transaction.objects.filter(list=list)
        return self.run_query(transactions, summary, pledged, authorized, incomplete, completed)
            
    def execute_campaign(self, campaign):
        '''
        execute_campaign
        
        attempts to execute all pending transactions for a campaign. 
        
        return value: returns a list of transactions with the status of each receiver/transaction updated
        
        '''               
        
        # only allow active transactions to go through again, if there is an error, intervention is needed
        transactions = Transaction.objects.filter(campaign=campaign, status=TRANSACTION_STATUS_ACTIVE)
        
        for t in transactions:
            # 
            # Currently receivers are only used for paypal, so it is OK to leave the paypal info here
            #
            receiver_list = [{'email':settings.PAYPAL_GLUEJAR_EMAIL, 'amount':t.amount}, 
                            {'email':campaign.paypal_receiver, 'amount':D(t.amount) * (D('1.00') - D(str(settings.GLUEJAR_COMMISSION)))}]
            
            self.execute_transaction(t, receiver_list) 

        # TO DO:  update campaign status
        # Should this be done first before executing the transactions?
        # How does the success/failure of transactions affect states of campaigns
        

        return transactions

    def finish_campaign(self, campaign):
        '''
        finish_campaign
        
        attempts to execute all remaining payment to non-primary receivers

        This is currently only supported for paypal
        
        return value: returns a list of transactions with the status of each receiver/transaction updated
        
        '''               
        
        # QUESTION:  to figure out which transactions are in a state in which the payment to the primary recipient is done but not to secondary recipient
        # Consider two possibilities:  status=IPN_PAY_STATUS_INCOMPLETE or execution = EXECUTE_TYPE_CHAINED_DELAYED
        # which one?  Let's try the second one
        # only allow incomplete transactions to go through again, if there is an error, intervention is needed
        transactions = Transaction.objects.filter(campaign=campaign, execution=EXECUTE_TYPE_CHAINED_DELAYED)
        
        for t in transactions:            
            result = self.finish_transaction(t) 

        # TO DO:  update campaign status
        
        
        return transactions
    
    def cancel_campaign(self, campaign):
        '''
        cancel_campaign
        
        attempts to cancel active preapprovals related to the campaign 

        
        return value: returns a list of transactions with the status of each receiver/transaction updated
        
        '''               
        
        transactions = Transaction.objects.filter(campaign=campaign, status=TRANSACTION_STATUS_ACTIVE)
        
        for t in transactions:            
            result = self.cancel_transaction(t) 

        # TO DO:  update campaign status

        return transactions    
        

    def finish_transaction(self, transaction):
        '''
        finish_transaction
        
        calls the paypal API to execute payment to non-primary receivers
        
        transaction: the transaction we want to complete
        
        '''
        
        if transaction.execution != EXECUTE_TYPE_CHAINED_DELAYED:
            logger.error("FinishTransaction called with invalid execution type")
            return False
        
        # mark this transaction as executed
        transaction.date_executed = now()
        transaction.save()
        
        method = getattr(transaction.get_payment_class(), "Finish")
        p = method(transaction)            
        
        # Create a response for this
        envelope = p.envelope()
        
        if envelope:
            correlation = p.correlation_id()
            timestamp = p.timestamp()
        
            r = PaymentResponse.objects.create(api=p.url,
                                              correlation_id = correlation,
                                              timestamp = timestamp,
                                              info = p.raw_response,
                                              transaction=transaction)
        
        if p.success() and not p.error():
            logger.info("finish_transaction Success")
            return True
        
        else:
            transaction.error = p.error_string()
            transaction.save()
            logger.info("finish_transaction error " + p.error_string())
            return False
        
    def execute_transaction(self, transaction, receiver_list):
        '''
        execute_transaction
        
        executes a single pending transaction.
        
        transaction: the transaction object to execute
        receiver_list: a list of receivers for the transaction, in this format:
        
                [
                    {'email':'email-1', 'amount':amount1}, 
                    {'email':'email-2', 'amount':amount2}
                ]
        
        return value: a bool indicating the success or failure of the process.  Please check the transaction status
        after the IPN has completed for full information
        
        '''        
        
        if len(transaction.receiver_set.all()) > 0:
            # we are re-submitting a transaction, wipe the old receiver list
            transaction.receiver_set.all().delete()
            
        transaction.create_receivers(receiver_list)
        
        # Mark as payment attempted so we will poll this periodically for status changes
        transaction.date_payment = now()
        transaction.save()
        
        method = getattr(transaction.get_payment_class(), "Execute")
        p = method(transaction)
        
        # Create a response for this
        envelope = p.envelope()
        
        if envelope:
        
            correlation = p.correlation_id()
            timestamp = p.timestamp()
        
            r = PaymentResponse.objects.create(api=p.api(),
                                              correlation_id = correlation,
                                              timestamp = timestamp,
                                              info = p.raw_response,
                                              transaction=transaction)
        
        # We will update our transaction status when we receive the IPN
        if p.success() and not p.error():
            transaction.pay_key = p.key()
            transaction.save()
            logger.info("execute_transaction Success")
            transaction_charged.send(sender=self, transaction=transaction)
            return True
        
        else:
            transaction.error = p.error_string()
            transaction.save()
            logger.info("execute_transaction Error: " + p.error_string())
            return False
    
    def cancel_transaction(self, transaction):
        '''
        cancel
        
        cancels a pre-approved transaction
        
        return value: True if successful, false otherwise
        '''        
        
        method = getattr(transaction.get_payment_class(), "CancelPreapproval")
        p = method(transaction) 
        
        # Create a response for this
        envelope = p.envelope()
        
        if envelope:
        
            correlation = p.correlation_id()
            timestamp = p.timestamp()
        
            r = PaymentResponse.objects.create(api=p.url,
                                              correlation_id = correlation,
                                              timestamp = timestamp,
                                              info = p.raw_response,
                                              transaction=transaction)
        
        if p.success() and not p.error():
            logger.info("Cancel Transaction " + str(transaction.id) + " Completed")
            return True
        
        else:
            transaction.error = p.error_string()
            transaction.save()
            logger.info("Cancel Transaction " + str(transaction.id) + " Failed with error: " + p.error_string())
            return False
        
    def authorize(self, currency, target, amount, expiry=None, campaign=None, list=None, user=None,
                  return_url=None, cancel_url=None, anonymous=False, premium=None,
                  paymentReason="unglue.it Pledge"):
        '''
        authorize
        
        authorizes a set amount of money to be collected at a later date
        
        currency: a 3-letter paypal currency code, i.e. USD
        target: a defined target type, i.e. TARGET_TYPE_CAMPAIGN, TARGET_TYPE_LIST, TARGET_TYPE_NONE
        amount: the amount to authorize
        campaign: optional campaign object(to be set with TARGET_TYPE_CAMPAIGN)
        list: optional list object(to be set with TARGET_TYPE_LIST)
        user: optional user object
        return_url: url to redirect supporter to after a successful PayPal transaction
        cancel_url: url to send supporter to if support hits cancel while in middle of PayPal transaction
        anonymous: whether this pledge is anonymous
        premium: the premium selected by the supporter for this transaction
        paymentReason:  a memo line that will show up in the Payer's Amazon (and Paypal?) account
        
        return value: a tuple of the new transaction object and a re-direct url.  If the process fails,
                      the redirect url will be None
                      
        '''        
            
        t = Transaction.objects.create(amount=amount, 
                                       max_amount=amount,
                                       type=PAYMENT_TYPE_AUTHORIZATION,
                                       execution = EXECUTE_TYPE_CHAINED_DELAYED,
                                       target=target,
                                       currency=currency,
                                       status='NONE',
                                       campaign=campaign,
                                       list=list,
                                       user=user,
                                       anonymous=anonymous,
                                       premium=premium
                                       )
        
        # we might want to not allow for a return_url or cancel_url to be passed in but calculated
        # here because we have immediate access to the Transaction object.
        
        if cancel_url is None:
            cancel_path = "{0}?{1}".format(reverse('pledge_cancel'), 
                                urllib.urlencode({'tid':t.id}))            
            cancel_url = urlparse.urljoin(settings.BASE_URL, cancel_path)
            
        if return_url is None:
            return_path = "{0}?{1}".format(reverse('pledge_complete'), 
                                urllib.urlencode({'tid':t.id})) 
            return_url = urlparse.urljoin(settings.BASE_URL, return_path)
        
        method = getattr(t.get_payment_class(), "Preapproval")
        p = method(t, amount, expiry, return_url=return_url, cancel_url=cancel_url, paymentReason=paymentReason) 
       
         # Create a response for this
        envelope = p.envelope()
        
        if envelope:        
            r = PaymentResponse.objects.create(api=p.url,
                                              correlation_id = p.correlation_id(),
                                              timestamp = p.timestamp(),
                                              info = p.raw_response,
                                              transaction=t)
        
        if p.success() and not p.error():
            t.preapproval_key = p.key()
            t.save()
            
            url = p.next_url()
                
            logger.info("Authorize Success: " + url)
            return t, url
    
        
        else:
            t.error = p.error_string()
            t.save()
            logger.info("Authorize Error: " + p.error_string())
            return t, None
        
    def modify_transaction(self, transaction, amount, expiry=None, anonymous=None, premium=None,
                           return_url=None, cancel_url=None,
                           paymentReason=None):
        '''
        modify
        
        Modifies a transaction.  The only type of modification allowed is to the amount and expiration date
        
        amount: the new amount
        expiry: the new expiration date, or if none the current expiration date will be used
        anonymous:  new anonymous value; if None, then keep old value
        premium: new premium selected; if None, then keep old value
        return_url: the return URL after the preapproval(if needed)
        cancel_url: the cancel url after the preapproval(if needed)
        paymentReason: a memo line that will show up in the Payer's Amazon (and Paypal?) account
        
        return value: True if successful, False otherwise.  An optional second parameter for the forward URL if a new authorhization is needed
        '''
        
        # Can only modify the amount of a preapproval for now
        if transaction.type != PAYMENT_TYPE_AUTHORIZATION:
            logger.info("Error, attempt to modify an invalid transaction type")
            return False, None
        
        # Can only modify an active, pending transaction.  If it is completed, we need to do a refund.  If it is incomplete,
        # then an IPN may be pending and we cannot touch it        
        if transaction.status != TRANSACTION_STATUS_ACTIVE:
            logger.info("Error, attempt to modify a transaction that is not active")
            return False, None
            
        # if any of expiry, anonymous, or premium is None, use the existing value          
        if expiry is None:
            expiry = transaction.date_expired
        if anonymous is None:
            anonymous = transaction.anonymous
        if premium is None:
            premium = transaction.premium
        
        if amount > transaction.max_amount or expiry != transaction.date_expired:
                
            # Start a new authorization for the new amount
            
            t, url = self.authorize(transaction.currency, 
                                    transaction.target,
                                    amount,
                                    expiry, 
                                    transaction.campaign, 
                                    transaction.list, 
                                    transaction.user, 
                                    return_url, 
                                    cancel_url, 
                                    transaction.anonymous,
                                    premium,
                                    paymentReason)
            
            if t and url:
                # Need to re-direct to approve the transaction
                logger.info("New authorization needed, redirection to url %s" % url)
                self.cancel_transaction(transaction)    
                return True, url
            else:
                # a problem in authorize
                logger.info("Error, unable to start a new authorization")
                return False, None
            
        elif amount <= transaction.max_amount:
            # Update transaction but leave the preapproval alone
            transaction.amount = amount
            transaction.anonymous = anonymous
            transaction.premium = premium
            
            transaction.save()
            logger.info("Updated amount of transaction to %f" % amount)
            return True, None
        else:
            # this shouldn't happen
            return False, None
        
        
    def refund_transaction(self, transaction):
        '''
        refund
        
        Refunds a transaction.  The money for the transaction may have gone to a number of places.   We can only
        refund money that is in our account
        
        return value: True if successful, false otherwise
        '''        
        
        # First check if a payment has been made.  It is possible that some of the receivers may be incomplete
        # We need to verify that the refund API will cancel these
        if transaction.status != TRANSACTION_STATUS_COMPLETE:
            logger.info("Refund Transaction failed, invalid transaction status")
            return False
        
        method = getattr(transaction.get_payment_class(), "RefundPayment")
        p = method(transaction) 
        
        # Create a response for this
        envelope = p.envelope()
        
        if envelope:
        
            correlation = p.correlation_id()
            timestamp = p.timestamp()
        
            r = PaymentResponse.objects.create(api=p.url,
                                              correlation_id = correlation,
                                              timestamp = timestamp,
                                              info = p.raw_response,
                                              transaction=transaction)
        
        if p.success() and not p.error():
            logger.info("Refund Transaction " + str(transaction.id) + " Completed")
            return True
        
        else:
            transaction.error = p.error_string()
            transaction.save()
            logger.info("Refund Transaction " + str(transaction.id) + " Failed with error: " + p.error_string())
            return False
        
    def pledge(self, currency, target, receiver_list, campaign=None, list=None, user=None, return_url=None, cancel_url=None, anonymous=False, premium=None):
        '''
        pledge
        
        Performs an instant payment
        
        currency: a 3-letter paypal currency code, i.e. USD
        target: a defined target type, i.e. TARGET_TYPE_CAMPAIGN, TARGET_TYPE_LIST, TARGET_TYPE_NONE
        receiver_list: a list of receivers for the transaction, in this format:
        
                [
                    {'email':'email-1', 'amount':amount1}, 
                    {'email':'email-2', 'amount':amount2}
                ]
        
        campaign: optional campaign object(to be set with TARGET_TYPE_CAMPAIGN)
        list: optional list object(to be set with TARGET_TYPE_LIST)
        user: optional user object
        return_url: url to redirect supporter to after a successful PayPal transaction
        cancel_url: url to send supporter to if support hits cancel while in middle of PayPal transaction
        anonymous: whether this pledge is anonymous
        premium: the premium selected by the supporter for this transaction        
        
        return value: a tuple of the new transaction object and a re-direct url.  If the process fails,
                      the redirect url will be None
                      
        '''            
        
        amount = D('0.00')
        
        # for chained payments, first amount is the total amount
        amount = D(receiver_list[0]['amount'])
            
        t = Transaction.objects.create(amount=amount,
                                       max_amount=amount, 
                                       type=PAYMENT_TYPE_INSTANT,
                                       execution=EXECUTE_TYPE_CHAINED_INSTANT,
                                       target=target,
                                       currency=currency,
                                       status='NONE',
                                       campaign=campaign,
                                       list=list,
                                       user=user,
                                       date_payment=now(),
                                       anonymous=anonymous,
                                       premium=premium
                                       )
    
        t.create_receivers(receiver_list)
        method = getattr(t.get_payment_class(), "Pay")
        p = method(t,return_url=return_url, cancel_url=cancel_url) 
        
         # Create a response for this
        envelope = p.envelope()
        logger.info(envelope)
        
        if envelope:        
            r = PaymentResponse.objects.create(api=p.api(),
                                              correlation_id = p.correlation_id(),
                                              timestamp = p.timestamp(),
                                              info = p.raw_response,
                                              transaction=t)
        
        if p.success() and not p.error():
            t.pay_key = p.key()
            t.status = TRANSACTION_STATUS_CREATED
            t.save()
            
            if self.embedded:
                url = p.embedded_url()
                logger.info(url)
            else:
                url = p.next_url()
                
            logger.info("Pledge Success: " + url)
            return t, url
        
        else:
            t.error = p.error_string()
            t.save()
            logger.info("Pledge Error: %s" % p.error_string())
            return t, None