Rules and laws revolving credit card surcharges vary by state and by card brand, be sure to verify that your business stays within compliance before implementing a surcharge.

Card Network Resources for Surcharging: 

• Visa Surcharging FAQ
• Visa Small Business Resource Center: Regulations and Fees
• Mastercard Surcharging Rules
• American Express Merchant Reference Guide
• Discover Merchant Acceptance Page

Articles regarding surcharges:

• https://www.merchantmaverick.com/credit-card-surcharges/

Applying surcharges:

• LaundryCard - System Setup; General Info
• FasCard / FLEX - Admin Site; Server Management