When you create a donation through the API, you will provide some user information to tie the donation to a user on Milkywire. The user information can either be email adress and name, or a unique anonymous identifier. This information is used to tie multiple donations done through the API to the same user on Milkywire.
The customer can then activate their account on Milkywire to follow their donations and see the impact they have.
Sounds like something for you? Get started by following this guide!