> ## Documentation Index > Fetch the complete documentation index at: https://docs.embedreach.com/llms.txt > Use this file to discover all available pages before exploring further. # Update Communication Group > Update a communication group ## OpenAPI ````yaml PATCH /api/communication-groups/{id} openapi: 3.0.0 info: title: Reach API version: 1.0.0 description: API documentation for Reach platform servers: - url: https://api.embedreach.com description: Production server security: [] paths: /api/communication-groups/{id}: patch: tags: - Communication Groups summary: Update Communication Group description: Update a communication group parameters: - name: reach-tenant-id in: header required: false schema: type: string description: >- If using a platform scoped JWT, you can pass in a header to impersonate a specific tenant to impersonate the request as. - schema: type: string description: The id of the communication group required: true description: The id of the communication group name: id in: path requestBody: content: application/json: schema: type: object properties: emailChannelSenderId: type: string nullable: true description: The id of the email channel sender emailHtmlBody: type: string description: The html body of the email emailCompiledHtml: type: string description: The compiled html body of the email emailCss: type: string description: The css body of the email emailTextBody: type: string description: The text body of the email emailSubject: type: string description: The subject of the email emailPreviewText: type: string description: The preview text of the email smsMessageBody: type: string description: The body of the sms message smsChannelSenderId: type: string nullable: true description: The id of the sms channel sender textMessageCompanyName: type: string nullable: true description: The company name to prefix the text message extraMergeFields: type: array nullable: true items: oneOf: - type: object properties: id: type: string description: The id of the merge field type: type: string enum: - static templateName: type: string description: >- The template name of the merge field (e.g. black_friday_coupon) displayName: type: string description: >- The display name of the merge field (e.g. "Black Friday Sale 50% off") staticValue: type: string description: >- The static value of the merge field (e.g. "CODE123") required: - id - type - templateName - displayName - staticValue - type: object properties: id: type: string description: The id of the merge field type: type: string enum: - dynamic mergeFields: type: array items: type: object properties: templateName: type: string description: >- The template name of the merge field (e.g. black_friday_coupon) displayName: type: string description: >- The display name of the merge field (e.g. "Black Friday Sale 50% off") image: type: object properties: placeholderUrl: type: string description: The placeholder url of the image maxSize: type: number description: The max size of the image in bytes required: - placeholderUrl - maxSize required: - templateName - displayName url: type: string description: The url to fetch the dynamic merge fields from parameters: type: object additionalProperties: nullable: true description: Additional parameters for the dynamic merge field required: - id - type - mergeFields - url description: The extra merge fields to include in the communication group textMessageMedia: type: array items: type: string description: Base64 encoded png images to include in the text message textMessageMediaUrls: type: array items: type: string description: The urls of the media to include in the text message responses: '200': description: Status 200 response content: application/json: schema: type: object properties: success: type: boolean message: type: string data: type: object properties: id: type: string description: The id of the communication group emailChannelSenderId: type: string nullable: true description: The id of the email channel sender emailHtmlBody: type: string nullable: true description: The html body of the email emailCss: type: string nullable: true description: The css body of the email emailCompiledHtml: type: string nullable: true description: The compiled html body of the email emailTextBody: type: string nullable: true description: The text body of the email emailSubject: type: string nullable: true description: The subject of the email emailPreviewText: type: string nullable: true description: The preview text of the email smsChannelSenderId: type: string nullable: true description: The id of the sms channel sender smsMessageBody: type: string nullable: true description: The body of the sms message textMessageCompanyName: type: string nullable: true description: The company name to prefix the text message textMessageMediaUrls: type: array nullable: true items: type: string description: The urls of the media to include in the text message required: - id - emailChannelSenderId - emailHtmlBody - emailCss - emailCompiledHtml - emailTextBody - emailSubject - emailPreviewText - smsChannelSenderId - smsMessageBody - textMessageCompanyName - textMessageMediaUrls required: - success '400': description: Bad Request - Validation or request error content: application/json: schema: type: object properties: success: type: boolean enum: - false default: false message: type: string description: Error message describing what went wrong errors: type: array items: type: string description: Optional array of specific validation errors required: - message ````