You can utilize the 'manual payment methods' feature in Shopify to build this out to your liking. There are preset manual payment options such as external credit, or external debit that you can use to instruct customers of your payment flow. In addition, there is an option to create a custom one yourself and include instructions for the customers. Our step-by-step guide on setting this up can be found here.
If there is anything else I can help you with, please let me know.
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