Contacts

Reusable contact groups fed once and reused across campaigns.

📄️ List your contact groups

Returns your groups with the number of contacts in each.

📄️ Create a contact group

Creates an empty group. Keep the returned `id`: this is the `contactGroupId` you pass to a campaign or a voice push.

📄️ Get a contact group

Returns one group and its contact count.

📄️ List the contacts of a group

Returns the contacts of the group, oldest first.

📄️ Add contacts to a group

Feeds a group. The body carries a **`contacts` array**, not a bare list of numbers.