Many project developers work with brokers to arrange the sale of their carbon credits. In this case, your company would get in touch with a broker and give them specifics about the type of project you’re looking for (location, price, etc.). The broker would find a project that suits you, then purchase carbon credits on your behalf and resell them to you with a mark-up.
This option can seem more practical than dealing directly with a project, particularly if you need a lot of carbon offsets: as a service provider, the broker handles all transactions.