A credit account is established for a merchant. A variable credit limit is set for the credit account. An indication is received that the merchant has accepted a payment account transaction to be charged to a customer's payment account. A transaction amount may be associated with the payment account transaction. The indication may also indicate that the payment account transaction has been authorized by an issuer of the customer's payment account. There may be a response in real time to the indication by instantaneously increasing the variable credit limit for the merchant's credit account by an amount that corresponds to the transaction amount.
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