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Version 2.32.1 shipped a regression that broke the Content-Type handling, so every API call failed with a 415. Fix: upgrade to 2.32.2, which reverts the bad change. Do not stay on 2.32.1. Several users confirmed payments worked again right after updating to 2.32.2. Source: https://github.com/mollie/mollie-api-php/issues/560
Source: https://github.com/mollie/mollie-api-php/issues/560