What is 'channel' in the upsert request

Channel is sale channel such as Agoda Private Sale, Mobile, etc. It is called "Seasonal Promotions" in YCS.

• Channel can only be included in promotion upsert request if that certain channel is activated.
• Channel ID 1 (Retail) is a default channel.
• Other channels have to be activated first by requesting Agoda support team or through Content Push API if supported by channel manager. Otherwise, if inactive channel IDs are included in the request, Agoda will return error 'channel ID can be either 0 or 1'