Note
in3, Klarna payment methods, and vouchers always use the Orders API. You cannot select an API method for these payment methods.
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Log in to Magento 2.
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Go to Stores > Configuration.
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Scroll to Mollie, select the arrow, and then Payment methods.
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Select the payment method that you want to configure.
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In the Method drop-down, select an API method.
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Select Save config.