Preamble
The typical restaurant owners/managers are mainly "old school" people used to talk face to face over a coffee or on the phone and cultivate real-life human bonding with their business partners, clients etc.
Typically, the restaurant owner/manager wants to look into your eyes, hear what you have to say, evaluate if they can count on you, and hold you responsible when the going gets tough, and then continue talking with you locally.
So focus on the benefits and what your service package can do for them. Don’t stress them too much with the technicalities. They often don’t care about the suppliers you choose in order to put your services together.
Therefore, you may supply them with thermal printers from overseas, restaurant equipment from a neighbouring state, printing services from across the town, online ordering from us, whatever - this is your business gig. The main thing a restaurant manager wants to know is what button staff should press to accept incoming orders and what's your phone number... just in case.
You may read some more answers about their typical mindset here.
They are primarily in the food cooking business, not really interested to fully dive into understanding how the internet works, what cloud hosting means, what SaaS stands for, etc. And even if they do, they conclude quickly that the online thing is some other type of service, more specifically your service, and the question they expect to be answered is how your expertise combining your suppliers is essential for their business.