> ## Documentation Index > Fetch the complete documentation index at: https://docs.tesouro.com/llms.txt > Use this file to discover all available pages before exploring further. # Update > Update custom template by ID ## OpenAPI ````yaml /.tooling/schemas/rest/tags/product-finops.json patch /finops/v1/mail-templates/{template_id} openapi: 3.1.0 info: title: Tesouro Partner API version: '2025-06-23' description: The Tesouro REST API, for Tesouro partners to integrate with our solution. termsOfService: https://tesouro.com/terms contact: name: Tesouro team url: https://tesouro.com/about/ email: developers@tesouro.com servers: - url: https://api.sandbox.tesouro.com description: Sandbox security: [] tags: - name: Accounting connections - name: Accounting data pull - name: Accounting synchronized records - name: Accounting tax rates - name: Analytics - name: Approval policies - name: Approval requests - name: Bank details - name: Comments - name: Cost centers - name: Counterpart VAT IDs - name: Counterpart addresses - name: Counterpart bank accounts - name: Counterpart contacts - name: Counterparts - name: Credit notes - name: Custom tax rates - name: Delivery notes - name: Documents - name: Entities - name: Entity users - name: Events - name: Files - name: Identity - name: Ledger accounts - name: Mail templates - name: Mailbox domains - name: Mailboxes - name: Measure units - name: OCR - name: Overdue reminders - name: PDF templates - name: Payable line items - name: Payables - name: Payment intents - name: Payment links - name: Payment methods - name: Payment records - name: Payment reminders - name: Payment terms - name: Products - name: Projects - name: Purchase orders - name: Receipts - name: Receivables - name: Recurrences - name: Tags - name: Text templates - name: Transactions - name: VAT rates - name: Webhook deliveries - name: Webhook subscriptions paths: /finops/v1/mail-templates/{template_id}: patch: tags: - Mail templates summary: Update description: Update custom template by ID operationId: patch_mail-templates_id parameters: - required: true schema: type: string format: date example: '2025-06-23' name: x-finops-version in: header - required: true schema: type: string format: uuid name: template_id in: path requestBody: content: application/json: schema: $ref: '#/components/schemas/UpdateCustomTemplateSchemaRequest' required: true responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/CustomTemplateDataSchema' '405': description: Method Not Allowed content: application/json: schema: $ref: '#/components/schemas/ErrorSchemaResponse' '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' '500': description: Internal Server Error content: application/json: schema: $ref: '#/components/schemas/ErrorSchemaResponse' security: - HTTPBearer: [] components: schemas: UpdateCustomTemplateSchemaRequest: properties: body_template: type: string description: Jinja2 compatible string with email body language: allOf: - $ref: '#/components/schemas/LanguageCodeEnum' description: Lowercase ISO code of language name: type: string maxLength: 128 minLength: 1 description: Custom template name serialization_alias: template_name subject_template: type: string description: Jinja2 compatible string with email subject additionalProperties: false type: object CustomTemplateDataSchema: properties: id: type: string format: uuid description: ID of email template created_at: type: string format: date-time description: Template created date and time updated_at: type: string format: date-time description: Template updated date and time body_template: type: string description: Jinja2 compatible email body template is_default: type: boolean description: Is default template language: type: string maxLength: 4 description: Lowercase ISO code of language name: type: string maxLength: 128 description: Name of the template subject_template: type: string maxLength: 2048 description: Jinja2 compatible email subject template type: type: string description: Document type of content additionalProperties: false type: object required: - id - created_at - updated_at - body_template - is_default - language - name - subject_template - type ErrorSchemaResponse: properties: error: $ref: '#/components/schemas/ErrorSchema' type: object required: - error HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array type: object LanguageCodeEnum: type: string enum: - ab - aa - af - ak - sq - am - ar - an - hy - av - ae - ay - az - bm - ba - eu - be - bn - bi - bs - br - bg - my - ca - ch - ce - ny - zh - cu - cv - kw - co - cr - hr - cs - da - dv - nl - dz - en - eo - et - ee - fo - fj - fi - fr - fy - ff - gd - gl - lg - ka - de - el - kl - gn - gu - ht - ha - he - hz - hi - ho - hu - io - ig - id - ia - ie - iu - ik - ga - it - ja - jv - kn - kr - ks - kk - km - ki - rw - ky - kv - kg - ko - kj - ku - lo - la - lv - li - ln - lt - lu - lb - mk - mg - ms - ml - mt - gv - mi - mr - mh - mn - na - nv - nd - nr - ng - ne - 'no' - nb - nn - ii - oc - oj - om - os - pi - ps - fa - pl - pt - pa - qu - ro - rm - rn - ru - se - sm - sg - sa - sc - sr - sn - sd - si - sk - sl - so - st - es - su - sw - ss - sv - tl - ty - tg - ta - tt - te - th - bo - ti - to - ts - tn - tr - tk - tw - ug - uk - ur - uz - ve - vi - vo - wa - cy - wo - xh - yi - yo - za - zu ErrorSchema: properties: message: type: string type: object required: - message ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array msg: type: string type: type: string type: object required: - loc - msg - type securitySchemes: HTTPBearer: type: http scheme: bearer ````