Yes. Whether you charge for your services, and how much you charge, is entirely up to your discretion. It is very common for ministers to charge for officiating wedding, for example. The amount that a minister charges varies widely depending on location, relationship to the couple being married, and exactly what the minister’s role in the wedding ceremony is. If you do intent to charge for your services, be sure to establish this with the couple early on in the discussion and to have clear communication about what is expected of you during the entire process (e.g. preparation, rehearsal, and the wedding ceremony itself).