Anyone experience with remote pings/invoices

Hello there,

I was wondering if anyone has any experience with remote pings to a invoice generating 3rd party? (Using the Membership Pro Plugin)

I've been looking all over, but I can't find any websites or programs that can generate invoices with a remote ping.

So if anyone knows any service that supports this, tested or untested, please let me know.

The laws in Europe are very strict, so it's pretty important that I find something that is able to do this.