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Implementing Parallel Payments
Integrating Parallel Payments Using the NVP API
9
100 May 2010 Express Checkout Integration Guide
The following syntax represents the total amount of the first payment:
PAYMENTREQUEST_0_AMT
The following represents the second line of the name for the third payment:
L_PAYMENTREQUEST_2_NAME1
Integrating Parallel Payments Using the NVP API
To integrate parallel payments using the NVP API, you need to use the syntax for creating
unique NVP request field names and create a unique set of fields for each payment. You also
need to set a few required variables.
To integrate parallel payments using the NVP interface to Express Checkout:
1. Create a unique set of NVP request fields for each payment you will be hosting on your
marketplace using the syntax PAYMENTREQUEST_
n_NVPREQUESTFIELDNAME where n is
a value from 0 - 9.
2. You are required to pass values in the following Payment Details Type fields in the call to
SetExpressCheckout and DoExpressCheckoutPayment. For each of the
n payments
you host:
– Pass the value Order in PAYMENTREQUEST_
n_PAYMENTACTION.
– Pass a unique value for PAYMENTREQUEST_
n_PAYMENTREQUESTID. You will use this
value to locate the matching payment response details for that payment.
– Pass the merchant’s Payer Id (secure merchant account Id) or the merchant’s email
address in PAYMENTREQUEST_
n_SELLERPAYPALACCOUNTID.
3. Use the Payment Details Item Type fields as appropriate in the call to
SetExpressCheckout and DoExpressCheckoutPayment to pass data about each
payment.
Result:
For each payment in the transaction, the DoExpressCheckoutPayment response returns:
z A PAYMENTINFO_n_PAYMENTREQUESTID value matching the
PAYMENTREQUEST_
n_PAYMENTREQUESTID value you passed in the
DoExpressCheckoutPayment request. Use this value to locate the response data for
each payment.
z A PAYMENTINFO_n_SELLERPAYPALACCOUNTID. This value is whichever one of the
following values was passed in:
– The merchant’s email address
- Express Checkout 1
- Integration Guide 1
- Contents 3
- Intended Audience 9
- Revision History 9
- ABLE 1.1 Revision history 10
- Introducing Express Checkout 11
- Express Checkout Flow 14
- Payment Option Entry Point 15
- Express Checkout Buttons 16
- Express Checkout Command 17
- Express Checkout Token Usage 18
- Express Checkout Button and 19
- Logo Image Integration 19
- Dynamic Images 20
- Configuring the Dynamic Image 20
- Set Up the Default Image 21
- Set Up Image for Dynamic Use 21
- Change the Locale 22
- Choose the Image 22
- Dynamic Image Parameters 23
- Locale Codes 23
- PayPal Name-Value Pair API 27
- Multiple API Operations 28
- API operations 29
- Obtaining API Credentials 30
- Creating an NVP Request 31
- Specifying an API Credential 32
- URL Encoding 33
- Executing NVP API Operations 34
- Responding to an NVP Response 35
- URL Decoding 36
- Implementing the Simplest 37
- Express Checkout Integration 37
- Testing an Express Checkout 43
- Integration 43
- Customizing Express Checkout 49
- Providing Gift Options 58
- Adding a Survey Question 61
- PayPal Page Style 62
- Changing the Locale 66
- Handling Shipping Addresses 68
- Shipping Address Override 72
- Buyer Pays on PayPal 75
- About the Instant Update API 77
- Setting Up the Callback 82
- Other Considerations 83
- Using the Callback 85
- Response Parameters 87
- Callback Request 88
- Callback Response 88
- Immediate Payment 91
- About Parallel Payments 97
- Post-Integration Experience 98
- Request Parameters: 102
- [successResponseFields] 103
- Handling Errors 108
- Handling Payment Settlements 109
- Handling Recurring Payments 113
- Recurring Payments Terms 114
- Specifying an Initial Payment 116
- Updating Addresses 124
- Updating the Billing Amount 124
- Using Other PayPal API 127
- Operations 127
- Handling Payment Review 128
- Checkout 131
- Redirect the Buyer to PayPal 133
- Complete the Transaction 134
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