How it works.
Your email is the gateway to your moneybutton account. ( Relayx, Handcash )
1) You will need an invite to join the beta and you can do that through this link https://mypaymail.co/
2) Upon approval you will be given a mypaymail account example : firstname.lastname@example.org
3) Adding new handles
In addition to your assigned handle you can create more handles as on the left side of the form. Each handle will cost $0.85 cents. You can use any amount of payment destination you wish.
4) What is interesting is the custom domian option on the right side.
If you or your organisation uses a custom domain for your emails, those emails can be linked to your payment destination. This means that anybody can pay you by sending money to your email address not your mypaymail handle.
I reached out to mypaymail on the process and they responded with this message.