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POST
Subscriber Update
Updates fields on an existing subscriber.
By REST convention this would ideally be a PUT request — but the ChatSyncs API only exposes it as POST. Use POST as shown below.
Where to find a label’s ID: open Subscriber Manager → Labels — the ID is shown next to each label name, ready to copy. Or call Label List to fetch all of them at once. See Finding Your IDs & API Token for a screenshot.

Body

application/x-www-form-urlencoded
apiToken
string
required

Your ChatSyncs API key (not a WhatsApp/Meta access token). Where to find it.

Example:

"API-KEY"

phone_number_id
string
required

The WhatsApp account's phone number ID. Where to find it.

Example:

"PHONE-NUMBER-ID"

phone_number
string
required

The subscriber's phone number, with country code, digits only.

Example:

"PHONE-NUMBER"

first_name
string

The subscriber's first name.

last_name
string

The subscriber's last name.

gender
string

The subscriber's gender.

label_ids
string

Comma-separated label IDs, e.g. 1,4,5. Where to find it.

Response

200 - application/json

Standard ChatSyncs response. status is "1" on success and "0" on failure.

status
string

"1" = success, "0" = failure.

message
string

Human-readable result message.