On the 1st day I’d charge a customer, say, $10, for a product and it's a fraction of the full price.
In, say, 7 days, and only if a certain condition becomes true, I want to charge him $90 more and by myself, without any addtional permission or action of a customer, and with certainty. Meaning, a credit card has to permit this action and amount right on the 1st day.
How can I do it? What API endpoints should I use? I’m a developer, I’m fine with programming it.
A customer will be notified about this scheme upfront.