Hey @semirte,
I'm sorry to hear what happened with the unexpected charge. When you have a billing agreement and multiple payment methods in your account, if the transaction with the selected payment method fails, we will take the charge from the backup payment method. When we initiate a request for a transaction on your behalf, we don't know whether or not there are funds for the payment. I apologize for any inconvenience this may cause.
- Ashley M
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