Fundraising plugin

I have the fundraising plugin set up, but the problem I am finding is this plugin requires the IPN to be set to:

http://endeavour.openorchard.org/wp-admin/admin-ajax.php?action=wdf-ipn-return-paypal

And I already have the IPN set to a different url because I am using Gravity Forms to get membership fees and make payments, which needs the IPN set to

http://endeavour.openorchard.org/?page=gf_paypal_ipn

I can see there is a way to set the IPN dynamically but not sure how to do this with the plugins.

https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_admin_IPNSetup#id091GJ202030

Ideas on how to make this all work? If not, then I will need to not use the Fundraising plugin.

Thanks