For UK Churches there is a PayPal giving fund, where there are no charges on any online donations made to your church. Donors can also opt to Gift Aid what they give which will give their gifts a 25% boost from the government.
You’ll need a Church PayPal account – which has been verified as a Charity account (which reduces fees on normal transactions too). That took a while – for us largely because the Letter of Authorisation you have to download, print and sign needs to be on headed paper to be accepted!
If you have a church PayPal account – then start enrolling here – it will take you to the verification pages if needed as part of sign up.