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Express Checkout Integration Guide August 7, 2012 25
Getting Started With Express Checkout
Troubleshooting Your Express Checkout Integration
7. Review the response string from the DoExpressCheckoutPayment API operation.
If the operation was successful, the response should include ACK set to Success, as
follows:
TIMESTAMP=2007%2d04%2d05T23%3a30%3a16Z
&CORRELATIONID=333fb808bb23
ACK=Success
&VERSION=XX%2e000000
&BUILD=1%2e0006
&TOKEN=EC%2d1NK66318YB717835M
&PAYMENTREQUEST_0_TRANSACTIONID=043144440L487742J
&PAYMENTREQUEST_0_TRANSACTIONTYPE=expresscheckout
&PAYMENTREQUEST_0_PAYMENTTYPE=instant
&PAYMENTREQUEST_0_ORDERTIME=2007%2d04%2d05T23%3a30%3a14Z
&PAYMENTREQUEST_0_AMT=19%2e95
&PAYMENTREQUEST_0_CURRENCYCODE=USD
&PAYMENTREQUEST_0_TAXAMT=0%2e00
&PAYMENTREQUEST_0_PAYMENTSTATUS=Pending
&PAYMENTREQUEST_0_PENDINGREASON=authorization
&PAYMENTREQUEST_0_REASONCODE=None
Security Issues
You must always be concerned with protecting sensitive data. This not only includes your API
credentials, but also any data exposed in a client’s browser, such as data about the transaction
stored in cookies.
In the simplest examples, such as the ones provided by PayPal to demonstrate Express
Checkout usage, the API credentials may be exposed. Thus, if you copy code from
examples or SDKs, you should always review your website for security issues and correct
them before you go live with your website.
Encrypt all saved information related to the PayPal transaction. For example, if you keep
order status information in a cookie, make sure the information is encrypted.
Use a secure transmission protocol, such as HTTPS to transfer information between your
site and PayPal. Do not use HTTP or insecure cURL.
Troubleshooting Your Express Checkout Integration
If you have trouble with your integration, there are several things you can check first. If you
try them yet continue to have problems, you can also contact Merchant Technical Support
(MTS).
If you cannot resolve the issue yourself, you will need to gather some basic information before
contacting MTS, including a log of the actions that led to the error. You can contact MTS at
https://www.paypal.com/mts.
- PayPal Express 1
- Checkout Integration 1
- Contents 3
- Preface 7
- Documentation Feedback 8
- Getting Started With Express 9
- Checkout 9
- A generic checkout flow 11
- Express Checkout flow 11
- Before You Start Coding 15
- Obtaining API Credentials 16
- Security Issues 25
- Error Handling 26
- Timeouts 26
- Express Checkout Features 27
- Recurring Payments 29
- Mobile Express Checkout 29
- Fraud Management Filters 30
- Event Notification 30
- Dynamic Images Overview 31
- Express Checkout Buttons 32
- Express Checkout Command 33
- Express Checkout Token Usage 34
- Requirements 35
- Checkout Entry Point 36
- Payment Option Entry Point 36
- PayPal Button and Logo Images 37
- Payment Mark 38
- Related API Operations 39
- Issuing Refunds 41
- Integrating Express Checkout 45
- With PayPal SDKs 45
- Going Live With Your Express 47
- Creating an API Certificate 50
- Importing Your Certificate 52
- PayPal Name-Value Pair API 55
- UTF-8 Character Encoding 56
- Multiple API Operations 56
- NVP Format 57
- Creating an NVP Request 58
- URL Encoding 60
- Executing NVP API Operations 61
- Responding to an NVP Response 62
- Common Response Fields 63
- Error Responses 63
- URL Decoding 64
- PayPal SOAP API Basics 65
- PayPal SOAP API Definitions 66
- Security 67
- SOAP Service Endpoints 68
- SOAP Request Envelope 68
- Request Structure 69
- Response Structure 71
- Date/Time Formats 75
- Revision History 77
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