I'm attempting to create an application where users are connected to a subject matter expert, and then billed for the time used. Obviously, I have no way of knowing how long any given conversation will be so I can't know an accurate amount to authorize. Authorizing an arbitrarily large amount and then only capturing the amount used technically works, but would understandably freak people out during checkout. A long term goal is integrate with PayPal Commerce Platform, so using BrainTree's Vault options seems to be off the table. Does anyone know the correct way to authorize an unknown amount using PayPal's checkout?
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