Can I restrict a certain payment method if a customer uses a coupon code in magento?

Yes, you can apply a payment restriction with a coupon code only:

Magento Payment Restrictions by Amasty

There is also an opportunity to disable payment restrictions if a particular coupon is used.

Easily interact with customers regarding the best prices for products with our Magento 2 Quote Extension.

Didn’t you find the answer to your question? We are always happy to help you out.

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