You have an option of adding a QR Code to your business cards and which are used by industries like real estate where they are used to drive users to the listing pages. Small Businesses also use QR code and to drive users for the payments or driving them to their online website for ordering.
Things to keep in mind while designing:
1. Font Size should be 8pt or above.
2. Any strokes or lines should be 1.5pt or above for good readability.
3. Avoid using white color areas in your design as they will blend with the material – clear, frosted or white background.