I need to link two APIs such that data sent on one API gets processed and it hits a second API with the processed data.
The first API needs to format the data and decide according to data format which second API needs to be used. I checked Zapier and it's working but it is not exactly what i need to do. So are there any options other than setting up my own server?

I wonder how Saas companies like Zapier, Zendesk, etc...build a lot of common 3rd party integrations that perform the same set of tasks. I mean, do they just brute force in building those market place integrations or do they have an architecture where everything just works if the API keys are configured?

Eg: github, gitlab, Jira apis kind of do the same set of tasks but their APIs are different in structure. Is there a normalisation technique behind the scenes or they just build the same stuff 3 times.

Are there any zapier devs here or people who made a zapier integration?

Maybe even with the integration being open source?

Just looking for how-did-they-do-it inspiration.

Who makes all these zapier integrations. Wild errors nobody has other than me, what the fuck