1. A computer-implemented method for fraud detection based on a pattern of transaction ticket size on a payment card network, the method implemented using a computer device coupled to a memory device, the method comprising: receiving transaction information electronically, for a current financial transaction, from a merchant, the transaction information including a current transaction amount, the transaction information associated with a single payment card cardholder account; retrieving a predetermined number of historical transactions for the single cardholder based on the transaction information; generating a historical spend ticket size pattern based on the retrieved historical transactions for the single cardholder, the historical spend ticket size pattern including at least (i) an average ticket size for the single cardholder for at least one of a same store, similar stores, and relevant merchant categories, and (ii) a standard deviation for the average ticket size for at least one of the same store, similar stores, and relevant merchant categories; comparing the current transaction amount to the historical spend ticket size pattern to determine if the current transaction is within the standard deviation for the average ticket size; and generating a recommendation for approval or decline of the current financial transaction based on the comparison.