I recently had a large amount of frustration and work trying to get an integration going with the PayPal Express Checkout for Digital Goods API. The steps to just get an account were tricky, but then weeding through all of the API documentation was hard. Mind you, I had just come off of building integrations with both SendGrid and Twilio, which have fantastic RESTful APIs. In all, the entire process was 8 hours. After that much trouble, I wanted to put online a few of the tips, tricks, code, and documentation links to help others out.
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