Split Transaction using PayPal with StartDonation API

Hello Team,

        Currently we are doing split transaction in our checkout, where our total product cost 20$, out of that 15$ will go to our account as product item cost and remaining 5$ as donation will go to Convio. These Split transaction is done with help of credit card processing, and for donation we are using donate API. This works perfectly.

       In the same way we have to do with PayPal, where $15 should go to my organisation PayPal Business Account and $5 should go to Clients Convio PayPal Account. We tried and $15 transferred to our Account, but by using same 'PayPal Token' how we can send the $5 to Convio. Also noticed Convio support donation through paypal using StartDonation API. But invoking this API responds with new token for buyer authentication, which makes user to authenticate twice which is not good idea. How can we do this with single authentication?

We have few other doubts, they are

1. Do we have any other API to make donation through paypal apart from StartDonation?

2. Another idea is if we get the client PayPal business account we can complete the parallel transaction using single authentication. If that is the case, is there any API to record the donation details in Convio without any transaction(Creadit Card or PayPal) through Convio?

Thanks Team.

Regards,

Sreedhar.T