Waiter admits using cocaine with Liam Payne but refuses payment

Prosecutors want to file charges in connection with a waiter Liam PayneAfter his death, he admits he did cocaine with the singer… but insists he didn’t get paid and is NOT a drug dealer.

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

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

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

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

There’s one gift he received from Liam, Paiz says… watch the clip to hear what keepsake he received.

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

Us too interviewed Liam’s good friend Roger Nores– who prosecutors accuse of abandoning and supplying drugs to Liam – and eyewitness Bret Watson …who saw Liam fall to his death.