Waiter admits he made cocaine with Liam Payne but refused payment

A servant prosecutors want to charge in relation to Liam Payne‘s death admits he used cocaine with the singer … but insists he wasn’t paid and is NOT a drug dealer.

Brian Paiz told us in our upcoming documentary “TMZ Investigates: Liam Payne: Who’s to Blame?” — sent on Monday evening at 8 PM ET on FOX — he partied with Liam in the singer’s Buenos Aires hotel room.

Paiz says they drank whiskey and used the cocaine he brought to the hotel. He says they did it on 2 occasions…the second just 2 days before Liam’s fatal fall from the hotel balcony.

Braian says he saw drugs scattered everywhere … along with the Dove soap box and tinfoil commonly seen in photos taken after Liam’s death.

Braian says he never accepted money from the singer … and claims he even turned down Payne’s Rolex watch when the star offered it as payment.

There’s a gift he took from Liam, Paiz says … watch the clip to hear what memento he received.

Paiz is one of five men prosecutors are going after in connection with Liam’s death.

We too interviewed Liam’s close friend Roger Nores– who prosecutors accuse of abandoning and drugging Liam – and eyewitnesses Bret Watson … there saw Liam fall to his death.