Hello,
We use Square API to create subscription and charge customers $50 /month . Recently we added a fee of 3.5% if a credit card is used and no extra fees if a debit card is used. We always allowed customers to be able to change the card connected to the subscription.
We are facing an issue where customers subscribe with debit card and then later change to a credit card during the subscription cycle. How do I dynamically add a credit card fee in subsequent auto debits ? Is it possible ?
example:
On 3/1/26 subscribes to a subscription with a debit card for $50/month.
On 3/10/26, customer changes the card to a credit card.
On 4/1/26, square is going to charge for $50. But we want to charge $51.75 which with a credit card fee of $1.75.
