In the 2005 "Constantine" movie the main character in the climax of the has a small tête–à–tête with the Devil- aka Lucifer Morningstar.
But in the Vertigo comic book universe, Lucifer has quit the job:
He became tired of the various stereotypes and prejudices that mortals held of him, such as the idea that he purchased and traded for souls, which were largely untrue, and that he forced mortals to commit evil acts. He had become tired of his reign over Hell, and felt it an unfair punishment that he should have to rule there forever simply because he once rebelled.
His job has been taken by the First of the Fallen, being much older that old Luc, who rules together with the Second and Third of the Fallen (until he realized that he is much more powerful than them) and he, not Morningstar is usually the main opponent of John Constantine.
So has Constantine ever met the original Devil?
Edit from the wikipedia
Constantine also makes a small cameo in Vertigo's Lucifer. In issue No. 5 he is seen drinking at Lucifer Morningstar's bar Lux, among guests that seek an audience with Lucifer about the gateway to the void outside of creation. According to himself he's not there to propose a trade with Lucifer, only to take "a quick look at the field". Lucifer Morningstar makes a return cameo in Hellblazer No. 192. Lucifer writer Mike Carey wrote Hellblazer between issues 175–215.