Payment methods retain ACH account type on tokens

When you tokenize ACH bank accounts, the payment method token now keeps the original account type instead of losing checking versus savings detail. You can tell how an account was classified at tokenization without asking the customer again.

• Token payment methods include an originalSubtype trait with the ACH account type from tokenization.
• Stored tokens expose that trait so integrations can treat checking and savings accounts differently when routing or displaying payment methods.