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Check the log files for error messages
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Enable debugging to see the full error message
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Check whether the payment method's customisation settings have an impact on their visibility.
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Check whether the payment method's localisation settings have an impact on their visibility.
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Check whether the payment method has been added to your sales channel(s).
In Shopware 6, an order might have an additional open status in the transaction history before it transitioned to the target order state. This is because Shopware 6 order states can have dependencies on each other↗. For example, an order that's complete can only go back into in process after transitioning to open.
The Mollie app handles these transitions automatically, which means you don't need to take action when this happens.