What credit card processors does Maid Central work with? What are your credit card fees?

Maid Central integrates with Authorize.net which is a gateway that allows you to choose your merchant processor. Different processors have different rates. 

Here is an article that might be useful to you, with more information: https://www.merchantmaverick.com/reviews/authorize-net-review/

Here is a short list of processor options:

https://www.authorize.net/sign-up/reseller-directory/

https://www.cardpaymentoptions.com/credit-card-processing/best-authorize-net/