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

# Update a project message template



## OpenAPI

````yaml /api-reference/openapi.json patch /api/projects/{projectSlug}/templates/{id}
openapi: 3.0.3
info:
  title: Polymorfa WhatsApp API
  version: 0.0.0
  description: >-
    Public Polymorfa REST API for sessions, messaging, media, webhooks,
    campaigns, templates, client tokens, widgets, and bridge routing.
  contact:
    name: Polymorfa API
    url: https://docs.polymorfa.com
servers:
  - url: https://api.polymorfa.com
security:
  - BearerAuth: []
paths:
  /api/projects/{projectSlug}/templates/{id}:
    patch:
      tags:
        - Templates
      summary: Update a project message template
      operationId: updateProjectTemplate
      parameters:
        - schema:
            type: string
          required: true
          name: projectSlug
          in: path
        - schema:
            type: string
          required: true
          name: id
          in: path
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UpdateMessageTemplateRequest'
      responses:
        '200':
          description: Updated
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UpdateProjectTemplateResponse'
        '400':
          description: Bad request — request body or params failed validation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Missing or invalid authentication token
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Authenticated but not permitted (missing scope or rule violation)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Resource not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      security:
        - BearerAuth: []
components:
  schemas:
    UpdateMessageTemplateRequest:
      type: object
      properties:
        name:
          type: string
          minLength: 1
        status:
          type: string
        definition:
          type: object
          additionalProperties:
            nullable: true
        sampleValues:
          type: object
          additionalProperties:
            type: string
    UpdateProjectTemplateResponse:
      type: object
      properties:
        success:
          type: boolean
          enum:
            - true
        data:
          $ref: '#/components/schemas/MessageTemplate'
      required:
        - success
        - data
    ErrorResponse:
      type: object
      properties:
        error:
          type: string
          description: Human-readable error message
        docs:
          type: string
          description: URL to the documentation for this error
      required:
        - error
    MessageTemplate:
      type: object
      properties:
        id:
          type: string
        name:
          type: string
        category:
          type: string
        language:
          type: string
        status:
          type: string
        kind:
          type: string
        definition:
          nullable: true
        sampleValues:
          nullable: true
        cloudLinks:
          type: array
          items:
            nullable: true
        createdAt:
          type: number
        updatedAt:
          type: number
      required:
        - id
        - name
        - category
        - language
        - status
        - kind
        - cloudLinks
        - createdAt
        - updatedAt
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: >-
        Polymorfa organization key (titan_ prefix), project token (titan_pt_
        prefix), or client token (titan_ct_ prefix), where the operation permits
        that audience.

````