# API

{% hint style="warning" %}
This section is intended for developers utilizing our APIs to add channels.
{% endhint %}

Below you will find the keys to generate secret payloads for adding or updating a channel via the [Script API](https://app.gitbook.com/s/J61ZiAn9bOjRfi7zlGtO/api/script).

Refer to the [onboarding page](https://docs.edgetag.io/channels/customer.io/onboarding) for detailed information on the purpose and usage of each input.

#### CUSTOMERIO\_SITE\_ID

Site ID from your Customer.io workspace.

Example value\
abc123def456

Type\
IDENTIFIER

Optional\
false

#### CUSTOMERIO\_API\_KEY

API key used for Customer.io Tracking API authentication.

Example value\
abc123def456

Type\
PASSWORD

Optional\
false

#### CUSTOMERIO\_REGION

Data region for the Customer.io workspace.

Example value\
us or eu

Type\
TEXT

Optional\
true

us – US (default): <https://track.customer.io\\>
eu – EU: <https://track-eu.customer.io>

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