Once is selected the payment method (Cash) should be trigger an API call to retrieve One time charge and recurrent charge.
Create an Integratio procedure, this IP should be receive the attribute modified (payment method cash or credit card)
This should be consumed on this template "OfferListSummary"
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Hi, I am a Salesforce Certified Platform Developer and I've past experience with the Integrations as well. I would like to assist you in this implementation.