Meta Pixel Tracking for Third Party Booking systems

I have been running FB ads for almost 2 years but pixel tracking is something I still can't seem to figure out 100%. I keep having issues when trying to track through third party booking systems for my clients. There has got to be a way to do this (other then lead form ads) but usually the devs that work for these booking systems are very relucent to install them.

Has anyone got any experience with this or any guidance?

how long has your account been in pixel?

facebook_ads expert said:

how long has your account been in pixel?

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this would be for setting up a new client so new pixel

Behavior tracking. Performance measurement. Create custom audiences specific to ad campaigns