I'm looking for a way to pay users to their PayPal account - ideally without manual intervention. I've looked at the MassPay & Payout APIs, but it seems that I need to hold the balance to be paid out in my PayPal account and there is no way to add funds to the PayPal account via the API.
I've also looked at the AdaptivePay API with the implicit payment option. However it fails to mention
1.) If I need to have the funds in the PayPal or if it will do an transfer from my primary banking source.
2.) What the fees for the transaction are? AFAIK it seems like payments can be made for free which would be strange considering the Payout API requires a fee.
Adaptive API with implicit payment will transfer the fund from the primary bank if balance cannot cover it, and implicit payment transaction fees is the same as normal transactions. MassPay & Payout APIs are usually used to send money to like hundreds of users while implicit payment can send money to 9 users at one time.