so i am making a multisites website, where businesses in my niche can sign up and get their own websites. i also already have a database of information on those businesses on my other website/server.
what would be the best way for me to link that info, so that if a company e.g. "ace bakery" signs up on my multisite, they can enter their "bakery id" somewhere (during registration or whenever) and then their multisite can fetch that specific info from my website, not just as a one-off but periodically update it.
would this be good for a widget? if so, do you know if there is something already existing that i can use or modify fairly easily? coding is not a problem but i'd rather not reinvent the wheel so to speak.