Photography Licensing Experts

Coming here because photography bloggers are not easy to talk to (everything is awful and taking away from the craft). My apologies to photographers in here. I need help, I need to add and provide a legitimate photography license within my app as part of the workflow. I want to reduce all friction from the sale and have the license embedded in the metadata in order to make both buyer and seller happy. Does anyone here know how or know someone who can help me?