> ## Documentation Index > Fetch the complete documentation index at: https://developers.wachat.net/llms.txt > Use this file to discover all available pages before exploring further. # Update contact > Updates the supplied fields of one contact without replacing unrelated attributes. Use it to keep recipient names, numbers, tags, or custom data synchronized with your application. ## OpenAPI ````yaml /openapi.json put /contacts/{id} openapi: 3.1.0 info: title: Wachat API version: v1 description: >- Wachat REST API. Authenticate with a workspace API key: send it as `Authorization: Bearer `. Generate keys in the dashboard under Developers / API. servers: - url: https://crm.wachat.net/api/v1 security: - http: [] tags: - name: Message description: >- Send a single WhatsApp message — text, media (image / video / document / audio) or a location pin — to one number, then read its delivery status or your message history. A file can be attached directly as a multipart `media` field or referenced by a public URL. - name: Template description: >- Create, list and manage your approved WhatsApp templates, and send a template to one number with your own header, body variables and button values. Use this for utility / marketing sends that need a pre-approved template — including one with a PDF / document header (pass the file's public URL as the header, e.g. from the Media endpoint). - name: Media description: >- Upload a file once (multipart / form-data, field name `file`, up to 16 MB) and get back a hosted public URL you can reuse across sends — for example a PDF to use as a document-header on a template, or an image on a message. - name: Contact description: >- Full create / read / update / delete over your contacts and leads, including search by number, tags and custom attributes. - name: ContactGroup description: >- Organise contacts into groups: create groups, list them, and add or remove members — handy for targeting broadcasts and campaigns. - name: Broadcast description: >- Send the same message to many contacts at once and track each broadcast's progress and per-recipient delivery. - name: Campaign description: >- Create, start, pause and monitor drip / marketing campaigns and their recipients. - name: Scheduled description: >- Schedule a WhatsApp send for a future time, list upcoming scheduled messages, and cancel one before it goes out. - name: AutoReply description: >- Manage keyword auto-replies — the automatic responses that fire when an inbound message matches a rule. - name: Flow description: >- Enroll a contact into an automation flow (chatbot) and manage your flows through the API. - name: Device description: >- List the WhatsApp numbers / devices connected to your workspace and check each one's connection status. - name: Webhook description: >- Register and manage webhook endpoints so Wachat POSTs real-time events (message received / sent / delivered / read / failed, plus campaign and contact events) to your server. When you set a signing secret each delivery carries an HMAC-SHA256 signature header you can verify. - name: Deal description: >- Manage sales-pipeline deals — create, list, update and move deals between stages. - name: Conversation description: >- Read your workspace inbox: list chat threads (conversations) and fetch the messages inside a thread. - name: Account description: Read your account details, plan, limits and message-credit usage. paths: /contacts/{id}: put: tags: - Contact summary: Update contact description: >- Updates the supplied fields of one contact without replacing unrelated attributes. Use it to keep recipient names, numbers, tags, or custom data synchronized with your application. operationId: v1.contacts.update parameters: - name: id in: path required: true schema: type: integer requestBody: content: application/json: schema: $ref: '#/components/schemas/UpdateContactRequest' responses: '200': description: Successful response. content: application/json: schema: type: object properties: data: type: array items: {} meta: type: string required: - data - meta '404': description: Request failed. content: application/json: schema: type: object properties: error: type: object properties: code: type: string const: not_found message: type: string const: Contact not found. details: type: string required: - code - message - details required: - error '422': $ref: '#/components/responses/ValidationException' description: Request failed. components: schemas: UpdateContactRequest: type: object description: >- Update an existing contact in the current workspace. Every field is optional — only the keys present in the request body are changed. Scramble reads these rules to document the request body. properties: name: type: - string - 'null' description: Contact's full display name. maxLength: 191 first_name: type: - string - 'null' description: Optional name parts. maxLength: 191 middle_name: type: - string - 'null' maxLength: 191 last_name: type: - string - 'null' maxLength: 191 title: type: - string - 'null' description: Optional salutation/title (e.g. Mr, Dr). maxLength: 50 phone: type: - string - 'null' description: Phone number in international format (digits, E.164). maxLength: 32 country_code: type: - string - 'null' description: Country dial code (e.g. +91). Prefixed onto the phone if missing. maxLength: 10 email: type: - string - 'null' format: email description: Email address. maxLength: 191 language: type: - string - 'null' description: Preferred language / locale. maxLength: 80 address: type: - string - 'null' description: Postal address. maxLength: 1000 note: type: - string - 'null' description: Free-text note attached to the contact. maxLength: 2000 attributes: type: - array - 'null' description: Free-form key/value attributes stored against the contact. items: type: string is_unsubscribed: type: - boolean - 'null' description: Whether the contact has opted out of messages. group_ids: type: - array - 'null' description: Group ids the contact belongs to (replaces the existing set). items: type: integer description: |- Scope the existence check to the caller's workspace so a foreign group id is rejected (was a global `exists` → cross-tenant ref). title: UpdateContactRequest responses: ValidationException: description: Validation error content: application/json: schema: type: object properties: message: type: string description: Errors overview. errors: type: object description: A detailed description of each field that failed validation. additionalProperties: type: array items: type: string required: - message - errors securitySchemes: http: type: http scheme: bearer ````