Possible Clues:

• Rectangular piece of plastic holding personal data required for financial transactions
• *Plastic with a chip?
• Piece of plastic with micro-processor
• Sting odd fellow for financial authorisation
• It may allow you to make an entrance
• Key substitute
• ID with microprocessor built in
• Bright comic has computer data on it
• Clever comical person has means of payment
• Alternative to cash