Read Understand Mollie statuses for an overview of how Mollie statuses are related to Magento 2 statuses, and how communication between Mollie and Magento 2 takes place.
If the statuses don't match, check whether payments are processing properly.
Log in to Magento 2.
Go to Stores > Configuration.
On the Configuration page, scroll to Mollie , select the arrow, and then General.
Scroll down to Debug and logging, and click Check last 100 debug log records.
View the log online, or download it as a text file.
The information provided in the logs should help you to understand which troubleshooting steps to take. We recommend that you share the log files with us whenever you contact support for assistance.
Before updating Mollie for Magento 2, review Mollie for Magento 2 releases to ensure compatibility with your version of Magento 2 or third-party modules.
To verify that the API keys are correct, follow the steps in Connect to Mollie.