We are working on one marketplace. Lets call it www.xyz.com.

Marketplace have lots of sellers who work on services like SEO or Designing etc.. and it has buyers who purchase those services. 

There are sellers who are well knows and working on many services with the help of their own team. To make their life easy, We want to provide them with integration of Asana, Slack and many more things that can help them to organize and scale better. 

As per my basic understanding, If seller create a webhook in his zapier account and provider xyz.com with webhook url to hit on specific action, We can implement this feature but I think the flow will be more tedious for seller and all of them might not be able to configure zapier easily. 

I want a solution where each seller don’t have to create webhooks of own their own but as an owner of xyz.com I can give them some way that they can configure things in xyz.com and do the integration of their slack and asana from xyz.com.

Is there a way possible for that?

Is there possible if we authenticate user on xyz.com with zapier login and create webhooks through API?