Need advice getting an app to work with multiple dealer platforms

Without getting too specific, I work for a dealership. I created an agentic app using claude code to assist in doing a task that usually could take me days to complete, down to a couple hours or less. A consultant suggested that I package and offer it to other dealers (as a SaaS product) because so many dealers have the same issue and it can save their company tons of time and money and it could be a lucrative product. The issue that I'm running into that I need help with is this. I currently have the app able to produce a desired outcome and automatically publish that outcome on my dealership website because I have access to that website and claude can see it, plan around it and test it. However, there are dozens, if not more, website hosts and inventory management systems that dealers use that I don't have access to. How can I make it so the app can work with inventory management system to produce the same results and automate this task, if I have no way to test it? TiA for any feedback. I know it's vague and I'm happy to answer whatever questions needed to get help that doesn't require giving away exactly what it's doing.

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Need advice getting an app to work with multiple dealer platforms