Not getting webhook notifications for customfields and contact tagging of an opportuntity

[29aparna]

I have created a new web-hook for an opportunity. Then i went to my salesforce account and tagged a new product to an existing opportunity and got the webhook notification.
Then i have tagged a new contact to the same opportunity, But didn't receive any notification.
Same with custom-fields also.
We have some custom fields for an opportunity. I have modified those fields but i didn't get any web-hook notification.

[jamesward]

I need some additional info... So you want to fire a webhook when a contact is created? Did you create a webhook for contact?

[29aparna]

I Need a web-hook when a contact is tagged to an opportunity

[jamesward]

I'm not sure what event triggers that. Maybe update on opportunity?