Hi, thank you for answering! I am going to explain a little more, what I meant was, I need to know how I can a customer send the payment link via mail without login .The same function having paypal on their website to apply for selling, Can see in the screenshot that i send before.
In three-step what we do,
1) we send the link of payment to the client via mail.
2) client receives the link, and forwards it to the sand box to make the payment.
3) once paid by paypal, which sends it to the download of the file.
I hope I explained better, so I can say that I am doing wrong or how I do it.Thank you for your attention.