2. Under My Account tab > Profile sub tab > My setting tools section > API Access row > click Update.
3. On Setting up API permissions and credentials section > Option 1 column > click Add or edit API permissions link.
4. On Manage Third Party Access section > Third Party Username > click Edit Third Party button
5. On Edit Third Party Permissions section > Granted Permissions > below boxes should be checked:
- Use Express Checkout to process payments
- Authorize and capture your PayPal transactions
- Generate consolidated reports for all accounts
7. Reprocess the refund and it should now work.
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