I need help understanding how to implement the flow where a user logs into PayPal once and then wants to use PayPal from then on for this merchant without having to approve each purchase. Do I need to use the Braintree SDK to do this? Or can I use the Rest API and retain the "vaulting" capabilities? Do I have to become PCI compliant for either of these? I own a small bike rental company, and I'm developing a mobile app, and I don't want my riders to have to login and approve every payment...
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