I am a beginner with paypal and trying to understand the client side rest api. I am no js expert but the code at https://developer.paypal.com/docs/integration/direct/express-checkout/integration-jsv4/client-side-REST-integration/ does not look too difficult. Is that what it takes? I am asking because I can not find any tutorials about client side only rest api. And also found this doc that seems to describe the same thing but it looks much more complicated when you also have to deal with oauth: https://github.com/paypal/paypal-checkout/blob/master/docs/paypal-rest-api.md
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