Get your Paypal Account/Receiver ID
Click the paypal button bellow and complete the transaction and your
unique account id (receiver_id) will be emailed to you.
You need to pay from the account you want the ID for.

Get your Paypal Sandbox Account/Receiver ID
Click the paypal button bellow and complete the transaction and your
unique account id (receiver_id) will be displayed on the screen.
You need to pay from the sandbox account you want the ID for.
If you are prompted to login to the paypal developer site do so and then
come back to this site in the same browser window and complete the transaction to
get the receiver_id for you sandbox account.