Associated products are not included in a deal's webhook payload. But what you could do is take the deal ID that is included in the webhook payload, and then make a request to the CRM Associations API: https://developers.hubspot.com/docs/methods/crm-associations/crm-associations-overview. You can use the definition ID for "deal to line item", which is 19. So your request URL would look something like /crm-associations/v1/associations/: objectId/HUBSPOT_DEFINED/19, where you plug in the deal ID the objectId . That will return you the deal's line item associations. Our documentation for line items is here: https://developers.hubspot.com/docs/methods/line-items/line-items-overview, but I think that should give you what you need.
Associated products are not included in a deal's webhook payload. But what you could do is take the deal ID that is included in the webhook payload, and then make a request to the CRM Associations API: https://developers.hubspot.com/docs/methods/crm-associations/crm-associations-overview. You can use the definition ID for "deal to line item", which is 19. So your request URL would look something like /crm-associations/v1/associations/: objectId/HUBSPOT_DEFINED/19, where you plug in the deal ID the objectId . That will return you the deal's line item associations. Our documentation for line items is here: https://developers.hubspot.com/docs/methods/line-items/line-items-overview, but I think that should give you what you need.