Support simulation of PayPal One Touch errors via fake-wallet about braintree_ios HOT 7 CLOSED

Yep. The PayPal One Touch URL does not strictly follow the x-callback-url spec, and I don't think there are plans to change that. @dgoldman-ebay?

Also note that the PayPal One Touch URL format and app switch protocol aren't documented or supported beyond the scope of v.zero's internal usage. While it is publicly discoverable by poking around (as you've found), it isn't a publicly published API and theoretically may change without notice. So we recommend that you do not use PayPal app switch outside of the documented v.zero integration.

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I was using the fake-wallet app to test payments. I clicked the error option, but I got an error, and this was due to the error callback url being nil. Is this not supposed to work? How am I supposed to test errors?

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@mobitar ok, now I think I understand the issue. So it seems like we have two options here:

1. Make it possible to simulate PayPal app login errors for testing and development using the fake wallet app, OR…
2. Remove the error button for the fake PayPal experience.

I'm reopening this and retitling for clarity, OK? Thanks!

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Option 2 seems out of the question since testing errors is pretty important.

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@mobitar The PayPal app does not currently return errors back to the Braintree SDK. Braintree SDK only receives success or cancel. While this fact does not necessarily justify the design choice, it does explain why the test wallet app does not allow tapping error for PayPal app switch requests.

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The thought is that the Wallet app should handle any errors that come up in the sense that the user can either correct error and re-try (hopefully successfully) or cancel.

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Enhancements are no longer being added to the 3.x branch. For enhancement requests on the latest version of the Braintree iOS SDK, please open new issues. Thanks!

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