What kind of lawyer do we need for setting up an MCA business for small businesses (ecommerce businesses)

We are a Fintech startup and we intend to offer funding options exclusively for Ecommerce businesses in the US Marketplace. Our business have already been registered and we've started building our software, processes and even our loan agreements and other legal documents. However, we recently decided to change from a loan model to an MCA and we need help in drafting the merchant cash advance funding agreement, advice in UCC filling, usury regulations, risk management and everything we need related to this change. We also some specific questions to ask like how would you add additional security without the MCA identifying specific assets and equipment, and other. What kind of lawyer can you help us with our needs?