1. A system for a single transaction card associated with multiple payment vehicles to complete a transaction, the system comprising: a memory device with computer-readable program code stored thereon; a communication device; a processing device operatively coupled to the memory device and the communication device, wherein the processing device is configured to execute the computer-readable program code to: generate, via the processing device, a single transaction card, wherein the single transaction card acts like a payment card and is associated with multiple payment vehicles available to a customer; determine the multiple payment vehicles available to the customer via communication via the communication device with issuing financial institution systems for each of the determined multiple payment vehicles; associate the determined multiple payment vehicles with the single transaction card based on contacting the issuing financial institution for each of the determined multiple payment vehicles and storing account information received from the issuing financial institution for each of the multiple payment vehicles on the memory device, wherein the account information is stored separately from the single transaction card; provide the single transaction card to the customer; provide a rules engine to a customer system via the communication device for customer rules input, wherein the inputted rules determine a selected payment vehicle for a transaction based on a rules triggering event; receive indication of a transaction between the customer and a merchant, wherein the indication is received at the communication device from a point-of-transaction system associated with a merchant, wherein the single transaction card was utilized in the transaction with the merchant; receive transaction details associated with the transaction between the customer and the merchant from the point-of-transaction system based on a request provided by the communication device, wherein transaction details include merchant type, merchant location, merchant name, products of the transaction, and total purchase amount; apply, instantaneously, the total purchase amount to a temporary line of credit to complete the transaction and present the temporary line of credit to the point-of-transaction system, wherein the temporary line of credit is provided to the merchant directly, whereby eliminating a customer interaction requirement with the merchant; detect, based at least in part on the transaction details, the triggering of rules based on the transaction details associated with the transaction; identify, the selected payment vehicle associated with the rule associated with the rules triggering; and apply, automatically based on the input received from the customer and the triggered rules, the selected payment vehicle from the determined multiple payment vehicles of the user retroactively to terminate the temporary line of credit and the total purchase amount of the transaction that was completed using the single transaction card.