General purpose reloadable card consolidating multiple transaction cards

A general purpose reloadable (GPR) card consolidating multiple transaction cards and having a unique card number, comprising:

• at least one transmission unit being connectable to a smart device to access a plurality of funding sources stored on the smart device;
• and each of the funding sources being a digital data of one of many different transaction cards input to the smart device by a user;
• a storage unit storing the plurality of funding sources thereon;
• a display being provided on a surface of the GPR card for showing the funding sources;
• an operation interface being provided on a surface of the GPR card for a user to select one of the funding sources shown on the display;
• a plurality of payment units being capable of transmitting the unique card number to a point of service (POS);
• a rechargeable battery;
• and
• a microprocessor being electrically connected to between the at least one transmission unit, the storage unit, the payment units, the display, the operation interface and the rechargeable battery;
• wherein the funding source selected by the user is set as a default funding choice, which is provided to a third party Application Programming Interface (API) service provider;
• and the third party API service provider holds a plurality of digital data of the user's preloaded transaction cards.