Saturday, August 22, 2015

Paypal Express Checkout Error

Problem :

Security header is not valid", "ErrorCode"=>"10002"


This error is shown when you are not properly logged into the sandbox account on paypal's site.

0. Login to
1. Go to
2. Copy API credentials for a sandox user with Business-Pro account.

1. Login to
2. Got to your site and checkout
3. When sent to paypal, login as one of your buyer test accounts


1. Bogus gateway to test PayPal
2. Classic API Endpoints
3. Merchant SDK Ruby
4. How to create and process an order using Express Checkout
5. Sample Webapp that generates SDK code to use