QB Issue Resolution:

No

Surcharging for using a CC card is illegal in the following states: California, Colorado, Connecticut, Florida, Kansas, Maine, Massachusetts, New York, Oklahoma and Texas.

You can however offer a discount for cash in those states – except in New York where no cash discounts are allowed

New fed laws went into effect in Jan, 2013 allowing surcharges providing the retailer

make customers aware up front that there is a surcharge and how much for using a CC – at the store entrance and at the cash register or if an online store at the first reference to accepting CC for sales

You can not use a surcharge for debit cards or prepaid cards (so personally I do not see how you could do this surcharge thing with online payments anyway)

surcharge fees must be itemized on the receipt, in store or online

an overview
http://www.cardfellow.com/charging-customers-a-credit-card-convenience-fee-at-check-out/

Resolution for Issue 'Can QB automatically charge customers for processing fees for using Credit Cards?' available: Yes (Solved).
Source: Intuit Community forum.

Can QB automatically charge customers for processing fees for using Credit Cards?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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