For simple one-sender-to-one-receiver integrations, PayPal recommends that you use Express Checkout via Braintree SDK or the REST API to process direct payments.
How do I get started with PayPal APIs and SDKs?
How do I integrate Express Checkout with CoreCommerce?
How do I integrate Checkout with Angell EYE for WooCommerce?
Why did I get API error code 10002?
What is Payment Review and how do I integrate it?
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