Add AVSResponseCode type and constants.

avs_response_code.go

@@ -0,0 +1,28 @@
+package braintree
+
+type AVSResponseCode string
+
+const (
+	// The postal code or street address provided matches the information on file with the cardholder's bank.
+	AVSResponseCodeMatches AVSResponseCode = "M"
+
+	// The postal code or street address provided does not match the information on file with the cardholder's bank.
+	AVSResponseCodeDoesNotMatch AVSResponseCode = "N"
+
+	// The card-issuing bank received the postal code or street address but did not verify whether it was correct.
+	// This typically happens if the processor declines an authorization before the bank evaluates the postal code.
+	AVSResponseCodeNotVerified AVSResponseCode = "U"
+
+	// No postal code or street address was provided.
+	AVSResponseCodeNotProvided AVSResponseCode = "I"
+
+	// AVS information was provided but the card-issuing bank does not participate in address verification.
+	// This typically indicates a card-issuing bank outside of the US, Canada, and the UK.
+	AVSResponseCodeNotSupported AVSResponseCode = "S"
+
+	// A system error prevented any verification of street address or postal code.
+	AVSResponseCodeSystemError AVSResponseCode = "E"
+
+	// AVS information was provided but this type of transaction does not support address verification.
+	AVSResponseCodeNotApplicable AVSResponseCode = "A"
+)