Hi, I would like to create a custom GPT to help analyse sales trends, help make forecasts and assist with material control for my restaurants. Does anyone have experience with API integrations to a restaurant POS system that can give some helpful tips?
Thanks
Welcome to the community!
Sounds like an interesting project. To create a GPT that can do that, you’ll need to first get the API documentation for said POS system. 
Hello, what POS are you running?
We are using a POS system called Apro and have integrated with delivery services with its API, so I don’t see it being a problem from their side as long as the GPT allows me to integrate?
They seem to be providing a fixed list of services that integrate, but I had to use a translator. Did you get in touch for them for the Schnitstellen? I guess what you need to do is make the GPT aware of the meals and drinks that get ordered, and provide it with a list of ingredients? Omg… that is so interesting. 
Link: Schnittstellen vom Kassensystem zu Gastronomiesystemen (is this the one?)
Yes, I am speaking to them at the moment if they can provide the API. If not, I will work with past data sets that I can download in .csv files and use to train the GPT to analyse historic data and find trends. Also keen to link it to a wather API to see if there are weather and sales correlations.
I found a service that claims they can streamline and simplify the training process for the GPT, but I would be cautious when giving valuable data like that to a third party.
I’m using a free app called Obsidian to compile my research and data, which might be useful to you if you end up having to grind through some data manually (let’s hope not though).
This might be useful to you, assuming it’s the right location:
When you scroll down all the way, you can download a PDF with monthly historical weather data.
I do Ai consulting, I wouldn’t use a custom gpt. I would go on Upwork hire someone who knows how to make algorithms/use the OpenAI API , then I would export data from the POS System (csv whatever- using automation/zapier to auto-run the data in ur algorithm…
Thank you for your advice, do you think this is a big / complicated job and do you have any recommendations for good contacts on Upwork?
It should not be too difficult if you have a general idea of which trends you want to look for. Typically, I just make a job post describing the task and meet with a few developers to discuss it. You will be able to tell if they are capable of the task.
Also, don’t rule out that something like this already exists before you build/ have it built. Often there may be options out there or even GitHub code where the work may already be done for you.