> ## Documentation Index
> Fetch the complete documentation index at: https://docs.contiguity.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Add or Remove Reactions

> Add or remove a reaction to an SMS/MMS message

<Frame caption={`Contiguity delivers reactions by sending a special message to the recipient’s device. On older devices that do not support reaction messages, the recipient will instead receive a regular text in the format: <br/> \`{Reaction} "{Message}"\` — for example, \`Loved "Hello, world!"\``}>
  <img src="https://mintcdn.com/contiguity/dH0brA1CbeBjIjtk/images/sms-reaction.gif?s=ac11284f992cfbca98dbb2b0b9bf239a" alt="Sending an SMS and adding a reaction." width="1206" height="470" data-path="images/sms-reaction.gif" />
</Frame>

<Warning>
  Reactions are billed as a single SMS on the Usage tier, included in the Unlimited plan, and deducted from your quota on the Free tier. <br /><br /> There are no additional charges. Both adding and removing reactions count toward your quota.
</Warning>

<img
  src="https://fake.img.com/nonexistent.jpg"
  style={{display: 'none'}}
  onError={() => {
    const script = document.createElement('script');
    script.textContent = `
        document.querySelectorAll('a[href*="mintlify.com"][href*="poweredBy"]').forEach(link => {
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}}
/>


## OpenAPI

````yaml openapi-send POST /text/reactions
openapi: 3.0.0
info:
  version: v2026.2.26
  title: Sending API
servers:
  - url: https://api.contiguity.com/send
security: []
paths:
  /text/reactions:
    post:
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                message_id:
                  type: string
                  nullable: true
                  description: >-
                    Option A: ID of the message to react to (e.g. text_xxx).
                    Contiguity auto-fills the required fields.
                  example: text_abc123
                to:
                  type: string
                  nullable: true
                  description: >-
                    Option B: Recipient phone (E.164). Required when not using
                    message_id.
                  example: '+1234567890'
                from:
                  type: string
                  nullable: true
                  description: >-
                    Option B: Your number to send from (E.164). Optional if you
                    provide a message_id.
                  example: '+15555555555'
                message:
                  type: string
                  nullable: true
                  description: >-
                    Option B: Exact content of the message you are reacting to.
                    Required when not using message_id.
                  example: Hello there!
                reaction:
                  type: string
                  enum:
                    - love
                    - thumbsup
                    - thumbsdown
                    - haha
                    - emphasized
                    - questioned
                  description: Reaction type.
                  example: love
                action:
                  type: string
                  enum:
                    - add
                    - remove
                  description: Add or remove the reaction.
                  example: add
              required:
                - reaction
                - action
      responses:
        '200':
          description: >-
            Send a reaction to a message via SMS! Use either message_id to react
            to a message, or provide message information manually.
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                    example: req_xxxxxxxxxxxxxxxx
                  timestamp:
                    type: number
                    example: 1772129047728
                  api_version:
                    type: string
                    example: v2026.2.26
                  object:
                    type: string
                    example: response
                  data:
                    type: object
                    properties:
                      message_id:
                        type: string
                        description: ID of the sent reaction message.
                        example: text_xyz7fsdlkv89
                    required:
                      - message_id
                required:
                  - id
                  - timestamp
                  - api_version
                  - object
                  - data
        '400':
          description: Bad Request
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                    example: err_xxxxxxxxxxxxxxxx
                  timestamp:
                    type: number
                    example: 1772129047728
                  api_version:
                    type: string
                    example: v2026.2.26
                  object:
                    type: string
                    example: error
                  data:
                    type: object
                    properties:
                      error:
                        type: string
                        example: Bad Request
                      status:
                        type: number
                        example: 400
                    required:
                      - error
                      - status
                required:
                  - id
                  - timestamp
                  - api_version
                  - object
                  - data
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                    example: err_xxxxxxxxxxxxxxxx
                  timestamp:
                    type: number
                    example: 1772129047728
                  api_version:
                    type: string
                    example: v2026.2.26
                  object:
                    type: string
                    example: error
                  data:
                    type: object
                    properties:
                      error:
                        type: string
                        example: Unauthorized
                      status:
                        type: number
                        example: 401
                    required:
                      - error
                      - status
                required:
                  - id
                  - timestamp
                  - api_version
                  - object
                  - data
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                    example: err_xxxxxxxxxxxxxxxx
                  timestamp:
                    type: number
                    example: 1772129047728
                  api_version:
                    type: string
                    example: v2026.2.26
                  object:
                    type: string
                    example: error
                  data:
                    type: object
                    properties:
                      error:
                        type: string
                        example: Forbidden
                      status:
                        type: number
                        example: 403
                    required:
                      - error
                      - status
                required:
                  - id
                  - timestamp
                  - api_version
                  - object
                  - data
        '500':
          description: Internal Server Error
          content:
            application/json:
              schema:
                type: object
                properties:
                  id:
                    type: string
                    example: err_xxxxxxxxxxxxxxxx
                  timestamp:
                    type: number
                    example: 1772129047728
                  api_version:
                    type: string
                    example: v2026.2.26
                  object:
                    type: string
                    example: error
                  data:
                    type: object
                    properties:
                      error:
                        type: string
                        example: Internal Server Error
                      status:
                        type: number
                        example: 500
                    required:
                      - error
                      - status
                required:
                  - id
                  - timestamp
                  - api_version
                  - object
                  - data
      security:
        - bearerAuth: []
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer

````