From the Board of the 
Friends of the Hamilton Branch Library:

The Donorbox payment system has the highest possible industry rating for its protection of financial data. We chose them for the quality of their services and their dedication to providing small non-profits a secure online payment system for collecting dues. Because we are a federal 501(c)(3) non-profit corporation, as well as a registered charity in the state of Maryland, your membership dues are tax-deductible to the fullest extent allowed by applicable laws.