Mollie PHP client: revoking a mandate fails with Non-existent query parameter testmode
The mandate revoke method put testmode in the query string, but the DELETE endpoint rejected it there. Fix: call $customer->revokeMandate($mandate->id) instead of the mandate resource's revoke method. This was the maintainer's suggested workaround and the reporter confirmed it worked. Mollie later fixed the AP…
Problem outcome: unknown