Build the piece around the job.
The card should make the action obvious: when to come back, what is being tracked, or what reward is being earned. The branding stays visible without taking space away from the functional part of the card.
These can be designed to match business cards, menus, packaging, signage and other customer touchpoints.
Stock, finish, quantity and writable areas depend on how the card will be used. Mention stamping, writing or repeated handling in the quote so the specification fits the job.
Project options
Use these as a starting point. The final specification is confirmed around the artwork, quantity, timing and intended use.