Name, specification, and an amount of raw materials as well. For example, if you were to request a sword, I would need enough iron to create the weapon as well. By contrast, a spear would need iron and wood, and so forth. Generally, the higher-quality the material, the better the item will be.

As for payment... let's just say that you'd owe me a favor, equal to a weapon that could easily be the difference between life and death. So far that's worked out well enough.
-Adel