Get a list of contacts associated with a custom object

Developer Support APIs & Integrations
1

We’ve created a cutom object (called Campaign) using API. Inserted couple of contacts using hubspot UI. Then, created couple of Campaigns using API. We then went into Hubspot’s UI and assigned contacts to a Campaign.

My question is:

Shouldn’t Custom Objects have default associations to Contacts? And if so, shouldn’t this API call return something:

curl --request GET \
 --url 'https://api.hubapi.com/crm/v3/objects/campaign/1977007899/associations/contact?limit=500&hapikey=27f27092-...........'

because right now it returns:

{
 "results": []
}

Our end goal is to associate a list of contacts with different Campaigns (aka custom object) and consequently have the ability to GET a list of contacts associated to a particular Campaign.

We’ve tried both API v3 and v4 with no luck.

2

Problem resolved, instead of “campaign” which is the name of our custom object, i had to use a Custom Object internal ID, aka 2-790…