I'm not sure if this is the correct forum for this, if not I apologize.
My wife and I would like to find a platform to receive donations per mile for charitable causes. We did this for our wedding registry but that was different as we weren't trying to garner donations per set interval.
Ideally, we would like donors to be able to choose how they would like to donate. Say $.01 for the entire length of the hike or $1 for 25 miles/days, etc., with donations going directly to the charity or to a fundraising site which is partnered with the charity.
I know I have heard of bike rides that did this and obviously events like the heart walk do this. I thought I would check here first to see if anyone could point me in the right direction.
As always, thanks in advance.
Edit for clarity: We are specifically looking for website platforms that would be able to help us accomplish our goals. Thanks!

