[w3c/payment-method-basic-card] Signaling payment handler details errors (#57)

For example, saying the CVV is wrong:

<img width="576" alt="screenshot 2018-06-26 14 14 33" src="https://user-images.githubusercontent.com/870154/42127263-eb5112e2-7c62-11e8-8542-d79ad5809095.png">
 

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https://github.com/w3c/payment-method-basic-card/issues/57

Received on Saturday, 30 June 2018 16:42:11 UTC