Hey, @apdallahabane.
Thanks for reaching out and posting this question.
If a third-party payment gateway has rejected your application for a merchant account, then you'll need to contact the payment gateway in order to resolve these issues. However, if you're looking for an alternative payment gateway for your store, then we've got a list of supported payment gateways on Shopify for your region.
If you have any other questions on this topic, then don't hesitate to let us know.
Elias | Social Care @ Shopify
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