API does not handle card / charge errors

[joshsmith]

Problem

We have just a match error for card declines right now. We should provide a more appropriate response to the user since there's no error handling specific to the card being declined at all.

no match of right hand side value: {:error, %Stripe.APIErrorResponse{code: "card_declined", message: "Your card was declined.", status_code: 402, type: "card_error"}}

[joshsmith]

The API also does not handle incorrect CVC code errors:

Stripe.APIErrorResponse{code: "incorrect_cvc", message: "Your card's security code is incorrect.", status_code: 402, type: "card_error"}}

[joshsmith]

We could get:

• card_declined (that processes immediately; or happens later after successfully attaching to a customer and results in a charge.failed webhook)
• incorrect_cvc
• expired_card
• processing_error

These ones are harder to get with our front-end but still possible:

• incorrect_number
• invalid_expiry_month
• invalid_expiry_year
• invalid_cvc