Mammon does not appear in the Ars Goetia. He has been summoned by our master Sortiarius for the first time about 15 years ago. He is the one that indicated we should work together to bring back all the daemon so they can help humanity. He is the driving force behind World of Angels and demons.
His power is to help the sorcerer achieve great wealth, abundance and richness. This is very true as the 5 of us have had a lot of great experiences in this field by calling Mammon.
Mammon is very strict and demanding. If you ask for material wealth and riches you will need to make rich offerings. The best offering for this daemon is Gold. Golden coins, pendants, necklaces, and so on. He will multiply each offering by 100 for the one who honors him.
He can only be called on Thursday, facing North. The first time he will ignore you. The second time he wil do a little bit to test you. If your offering is accepted by him he will start working for you as no other daemon does.
He is the first daemon who accepted to be consecrated in the sheet metal but only in Sterling Silver, Stainless Steel or Gold