> ## Documentation Index > Fetch the complete documentation index at: https://moengage.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Update SMS Template > This API updates an SMS template by specifying its external template ID. You can specify in the request whether the updated version of the template can be used in active campaigns. #### Rate Limit The rate limit is **100 RPM**. ## OpenAPI ````yaml /api/sms-templates/sms-templates.yaml put /custom-templates/sms openapi: 3.0.3 info: title: MoEngage SMS Template API version: '1.0' description: >- API for creating, updating, and searching SMS templates within the MoEngage platform. servers: - url: https://api-{dc}.moengage.com/v1.0 description: MoEngage Custom Templates API Server variables: dc: default: '01' description: >- The ‘dc’ in the API Endpoint URL refers to the MoEngage Data Center (DC). MoEngage hosts each customer in a different DC. You can find your DC number and replace the value of ‘dc’ in the URL by referring to the DC and API endpoint mapping [here](/api/introduction#data-centers). Your MoEngage Data Center (DC) can be 01, 02, 03, 04, 05, 06, or 101. security: - basicAuth: [] tags: - name: SMS Templates description: Operations to manage SMS templates. paths: /custom-templates/sms: put: tags: - SMS Templates summary: Update SMS Template description: >- This API updates an SMS template by specifying its external template ID. You can specify in the request whether the updated version of the template can be used in active campaigns. requestBody: required: true description: The updated details for the SMS template. content: application/json: schema: $ref: '#/components/schemas/UpdateSmsTemplateRequest' example: external_template_id: d05a44f0-a7cf-471a-bcb6-63054800a367 update_campaigns: false basic_details: message: >- Hi {{UserAttribute['first_name']}}, your order has been delivered! meta_info: template_name: Shipping Update Template V2 updated_by: jane.doe@example.com template_version: '2' responses: '200': description: Template updated successfully. content: application/json: schema: type: object properties: external_template_id: type: string format: uuid description: The unique ID of the updated template. examples: success: summary: Successful Update value: external_template_id: eca024b7-a8ea-4f31-9154-5b80c85d18a9 '400': description: >- Bad Request. Invalid `external_template_id` or other request data validation errors. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: invalid_id: summary: Invalid Template ID value: error: code: 400 Bad Request message: Invalid template id details: - code: MissingValue target: 9925c8 message: 9925c8 is invalid template id. request_id: BTkUaYgU '500': description: Internal Server Error. content: application/json: schema: $ref: '#/components/schemas/InternalServerError' examples: server_error: summary: Internal Server Error value: title: Internal Server Error message: >- An unexpected error was encountered while processing this request. Please contact MoEngage Team components: schemas: UpdateSmsTemplateRequest: type: object required: - external_template_id - basic_details - meta_info properties: external_template_id: type: string format: uuid description: >- This field contains the unique identifier that is generated by MoEngage during the template creation. update_campaigns: type: boolean default: false description: >- If true, this field contains a flag used to update all active campaigns currently using the template being updated to the newer version (being updated in this request). basic_details: type: object description: This field contains the basic details of the SMS template. required: - message properties: message: type: string description: This field contains the updated content of the template. meta_info: type: object description: This field contains information about the template being created. required: - template_name - updated_by properties: template_name: type: string description: This field contains the name of the template being updated. updated_by: type: string format: email description: >- This field contains the email ID of the person updating the template. template_version: type: string description: This field contains the version of the template (optional). ErrorResponse: type: object description: Standard error response format for 4xx errors. properties: error: type: object description: This field contains the reason for the request's failure. properties: code: type: string description: The HTTP status code and error type. example: 4xx Status Code message: type: string description: A description of the error. example: Brief description of the error. details: type: array description: >- This is a List of the error details objects. Each object contains the following information. items: type: object properties: code: type: string example: ErrorCode target: type: string example: Field Name message: type: string example: Error description for this field. request_id: type: string description: This field contains the unique id pertaining to the request. example: Unique Request ID InternalServerError: type: object description: Schema for 500 Internal Server Error. properties: title: type: string example: Internal Server Error message: type: string example: >- An unexpected error was encountered while processing this request. Please contact MoEngage Team securitySchemes: basicAuth: type: http scheme: basic description: > Authentication is done via Basic Auth. This requires a base64-encoded string of your credentials in the format 'username:password'. - **Username**: Use your MoEngage workspace ID (also known as the App ID). You can find it in the MoEngage dashboard at **Settings** > **Account** > **APIs** > **Workspace ID (earlier app id)**. - **Password**: Use your API Key, which you can find within the **Campaign report/Business events/Custom templates/Catalog API/Inform Report** tile. For more information on authentication and getting your credentials, refer [here](https://www.moengage.com/docs/api/introduction#getting-your-credentials). ````