Senders
Retrieve the list of available senders, filtered by one or more channel types.
A sender is the channel-specific identity a message is sent from - for example an RBM agent ID, an SMS short code or alphanumeric sender ID, a Telegram bot username, or a WhatsApp phone number. GET /v1/senders accepts an optional channelType query parameter with a comma-separated list of channels (such as rbm,sms,whatsApp); omitting it returns senders configured for all channels on the account.