curl --request GET \
  --url https://api.pubrio.com/channels/types/templates \
  --header 'pubrio-api-key: <api-key>'

{
  "data": [
    {
      "channel_type_id": 1,
      "slug": "email",
      "channel_type_identifier": "db3ecea8-b838-4cfa-8aa1-c358223b0060",
      "logo_url": "https://buckets.pubrio.com/technology-logo/tdurnBxI97MV1hr2L1QaYgt.jpg",
      "node_type": "action",
      "channel_nodes": [
        {
          "channel_node_id": "93873c33-2635-4537-928c-6a4f3564164c",
          "channel_node_identifier": "30896b66-7fc7-42bf-b5fe-ce7e1fdb9e30",
          "channel_type_id": 1,
          "slug": "send_email",
          "parameter_properties": [
            {
              "name": "Subject",
              "slug": "subject",
              "hints": "My subject line",
              "field_type": "string",
              "max_length": 1000,
              "min_length": 1,
              "description": "Subject line of the email",
              "is_required": true,
              "display_type": "string",
              "supported_tools": [
                "variables"
              ],
              "is_template_field": true,
              "is_verify_required": false,
              "is_display_as_snippet": true,
              "is_return_in_plain_text": true
            },
            {
              "name": "Content",
              "slug": "content",
              "hints": "Write your email content",
              "field_type": "string",
              "max_length": 250000,
              "min_length": 0,
              "description": "HTML text message of email",
              "is_required": true,
              "display_type": "email_editor",
              "supported_tools": [
                "formatting_options",
                "variables",
                "insert_link",
                "attachments",
                "insert_photo",
                "code_mode",
                {
                  "slug": "insert_signature",
                  "syntax": "{{insert_signature.signature_html}}"
                }
              ],
              "is_template_field": true,
              "is_verify_required": false,
              "is_attachment_allowed": true,
              "is_display_as_snippet": false,
              "is_return_in_plain_text": false
            },
            {
              "name": "Attachments",
              "slug": "attachments",
              "hints": null,
              "field_type": "array",
              "max_length": 25,
              "min_length": 0,
              "description": null,
              "is_required": false,
              "display_type": null,
              "is_template_field": true,
              "is_verify_required": false,
              "is_attachment_allowed": true,
              "is_hide_from_control_panel": true
            }
          ],
          "is_template_available": true,
          "logo_url": "https://buckets.pubrio.com/technology-logo/tdurnBxI97MV1hr2L1QaYgt.jpg",
          "node_type": "action",
          "input_properties": [
            {
              "name": "To email addresses [multiple comma-separated]",
              "slug": "to_email_addresses",
              "hints": "[email protected]",
              "field_type": "array",
              "max_length": 1000,
              "min_length": 1,
              "description": "Email address of the recipient",
              "is_required": true,
              "display_type": "email_input",
              "is_verify_required": false
            }
          ],
          "name": "Send Email",
          "description": "The Send Email node sends emails using the connected email provider."
        }
      ],
      "name": "Email",
      "description": "Sends automated emails based on triggers or events."
    },
    "..."
  ]
}