+/** Card numbers for tests.
+ * Non 3D-Secure shop:
+ * 4970 1000 0000 0003 Payment accepted (authorized)
+ * 3D-Secure shop:
+ * 4970 1000 0000 0000 Payment accepted, with user authentication.
+ * 4970 1000 0000 0001 Payment accepted, without user authentication (non 3D-Secure user).
+ * 4970 1000 0000 0002 Must contact card issuer (which must force transaction). Succesful authentication.
+ * 4970 1000 0000 0006 Technical issue while computing payment warranty.
+ * 4970 1000 0000 0007 Technical issue during user authentication.
+ * 4970 1000 0000 0097 Payment refused due to 3D-Secure authentication failure (user failed to authenticate).
+ * 4970 1000 0000 0098 Payment refused (user credit limit overrun).
+ * 4970 1000 0000 0099 Payment refused (invalid credit card visual cryptogramm).
+*/
+