See the following article for detail on Pledgeling's fees:
https://help.pledgeling.org/a/solutions/articles/36000036077
It summarizes the charges for:
- credit card processing (2.9% + 30¢ per charge)
- One of the following usually apply, although there are exceptions if the costs are sponsored or the donor elects "cover our costs:"
- technology fee (if the donation form was not configured for optional tips)
- tips, if enabled. Tips are optional and adjustable by the donor.
- per-check fee for disbursements
- fee for disbursements to organizations outside the U.S.