It is not possible to enforce a specific payment method via a payment link created from the Merchant Back Office.
However, there are two alternative solutions:
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Open a new storeBy opening a new store, you will be able to configure a single payment method for that store. You can then send a payment link via that store.
To open a new store, contact the E-Banking Merchant Support Service. -
Use WebServicesIntegrate the Charge/CreatePaymentOrder method from WebServices by configuring the paymentMethods field to enforce the desired payment method.
The WebServices REST feature must be enabled on your store to be used.