Add hardcoded test for Masterpass - provide your own cart & transaction id and publishable key
Add hardcoded test for Masterpass - provide your own cart & transaction id and publishable key

These are not re-usable, so you need to provide new values every time the test is run.
I wish I had a better testing story here, but this is what we've come up with so far.

stripe/stripe-ios,stripe/stripe-ios,stripe/stripe-ios,stripe/stripe-ios,stripe/stripe-ios,stripe/stripe-ios