Unique idetifier

I am wondering if it is possible to insert a unique identifier such as a post id in to the donate button. I have a site I am building for a client that will have multiple charities displayed on his site. It can all funnel into the same PP account but I need a way of identifying which charity received the donation. postid would be fine and to have that displayed with the donor report.

Thank you,

JMTECH GLOBAL

https://ww.wp.xz.cn/plugins/seamless-donations/