API Reference

Send RCS message

post
https://api.transmitmessage.com/v2/rcs/messages

This endpoint is in beta and may change in future versions. Sends an RCS message to a single recipient.

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Body Params
string
required

The RCS agent ID assigned to your registered agent.

Unlike SMS, WhatsApp, and MMS, RCS messages do not come from a phone number. They are always sent through an agent.

  • Must be a registered RCS agent identifier.
  • Example: DemoSender
  • Can be alphanumeric or numeric.
string
required

The destination number for delivery. Can be either in local format or in international format. For international format, it should follow the E.164 standard.

Examples of conversions to E.164 format:

  • Australia: 0438 333 061 → 61438333061
  • UK: 07123 456 789 → 447123456789
string
enum
required

Type of the message content (currently only text supported).

Allowed:
content
required

The message content to be sent.

  • Supports both Basic RCS messages (160 characters) and Simple RCS messages (3072 characters)
  • UTF-8 and emoji support included
sms_fallback
object

Provides intelligent fallback for non-RCS capable devices and carrier delivery issues. If the RCS message fails, the SMS will send the configured message to the recipient instead.

string

A reference supplied by your system. Maximum length of 500 characters.

This reference is included in webhook events so you can relate events with the original message.

For example, being able to relate a Link Hit event to a specific sent message.

Responses

Updated about 21 hours ago

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Updated about 21 hours ago