10536 Invalid Data The transaction was refused as a result of a duplicate invoice ID supplied. Attempt with a new invoice ID.1. Log on to https://www.sandbox.paypal.com/
2. Click on "Profile" button.
3. Under the Security and risk settings, click on "Payment receiving preferences".
4. check the "No, allow multiple payments per invoice ID" checkbox.
5. Click on "Save" button.
Reference:
https://developer.paypal.com/docs/classic/api/errorcodes/
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