Hi jjorgewill,
The error "RESOURCE_NOT_FOUND" typically means you're trying to access a resource that either doesn't belong to your account or simply doesn't exist. Just to confirm, are you receiving this error with the billing agreement ID I-HT38K76XPMGJ from our example or are you using your own billing agreement ID and REST app credentials? If you can also provide us a new PayPal debug ID, it would be very helpful.
Thanks!
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