I run a wordpress website providing free legal help. To fund the site I want to place an instant messenger service, whereby, for a small fee, someone can get an answer to their question right away. Is there such an app which would do this? They type in there question and it comes through to my mobile device maybe, if I'm out and about. I then tell them if I will accept the question and send them a payment link to Paypal perhaps? As soon as the payment is made I give them a full answer and e-mail them within 24 hours with an even fuller response. The problem with sending a paypal invoice each time is that I will have to draft a fresh one each time somebody contacts me with a question, surely? If anyone knows of any app that may be able to help I'd appreciate your input.