Symptoms

Error while accessing Plesk from WHMCS via API

Error code: 1013. Error message: Customer with external id 'whmcs_plesk_XX' is not found in panel.

Cause

external_id entry is missing for Plesk user abcd in PSA clients table.

Resolution

1. Create backup of PSA database .

2. Login to Plesk database .

3. Update the following value:

   mysql> update clients set external_id='whmcs_plesk_XX'  where login='abcd';