Experiencing the same results. Can generate a token, and the results there look nearly identical to what you are seeing. However, all endpoints return the "invalid_token" error. (and I've tried all variations on the endpoints: api.paypal api-m.paypal api-m.sandbox.paypal api.sandbox.paypal What I'm planning on trying next is seeing if there is some kind of date range on transactions, so I'll be doing some test purchases etc... I haven't actually done anything with the sandbox account for @ least a year. However, I have tried pulling the card data as well and this (IF it's the card data from the account... which I actually don't know) seems like it should not be time sensitive.
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