> ## Documentation Index > Fetch the complete documentation index at: https://docs.nextlevelmca.com/llms.txt > Use this file to discover all available pages before exploring further. # Add a business note > Adds a note to the business timeline, attributed to the credential. ## OpenAPI ````yaml /openapi/public-v1.json post /v1/businesses/{id}/notes openapi: 3.0.0 info: title: NextLevel MCA Public API description: >- REST API for the NextLevel MCA deal platform. Objects flow Businesses → People → Deals → Submissions → Offers → Advances. **Authentication.** Send `Authorization: Bearer ` with an API key (`nlmca_live_…`, created in Settings → Developers) or an OAuth access token. Keys are scoped to one location. **Conventions.** JSON only. Cursor pagination (`limit` ≤ 100, `cursor` from `meta.next_cursor`). Every success is `{ data, meta }`; every error is `{ error: { type, message, code, param, request_id } }`. POST endpoints accept `Idempotency-Key` (24h replay). Rate limit 300 requests/min per credential (`X-RateLimit-*` headers). **Scopes.** Keys with no scopes have all of them. Otherwise: - `businesses:read` — Read businesses and their notes, tasks and activity - `businesses:write` — Create and update businesses, notes and tasks - `people:read` — Read people (contacts and owners) - `people:write` — Create and update people - `deals:read` — Read deals, submissions and the pipeline - `deals:write` — Create and update deals, move stages - `documents:read` — Read documents and statement analysis - `documents:write` — Upload documents and request documents from merchants - `lenders:read` — Read lenders, criteria and lender matches - `lenders:write` — Create and update lenders and criteria - `submissions:write` — Submit deals to lenders and withdraw submissions - `offers:read` — Read offers - `offers:write` — Log and update offers, set the primary offer - `advances:read` — Read funded advances and renewal flags - `advances:write` — Update advances - `portal:send` — Generate and send merchant portal links - `webhooks:manage` — Manage webhook subscriptions version: '1.0' contact: {} servers: - url: https://api.nextlevelmca.com description: Production security: - bearer: [] tags: - name: Businesses description: Merchant businesses and their notes, tasks and activity - name: People description: Contacts and owners. Phone lookups normalise to E.164. - name: Deals description: Deals, stage moves, renewals and the pipeline - name: Documents description: Documents, presigned uploads, document requests and statement analysis - name: Lenders description: Lenders and their criteria - name: Lender matches description: Criteria-driven lender matching for a deal - name: Submissions description: Sending deals to lenders - name: Offers description: Lender offers and the primary offer - name: Advances description: Funded advances and renewal readiness - name: Merchant portal description: Magic links for the merchant portal - name: Webhooks description: Outbound event subscriptions paths: /v1/businesses/{id}/notes: post: tags: - Businesses summary: Add a business note description: Adds a note to the business timeline, attributed to the credential. operationId: businesses_createNote parameters: - name: id required: true in: path description: Business id schema: type: string requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/NoteCreateDto' responses: '201': description: Created content: application/json: schema: type: object required: - data - meta properties: data: $ref: '#/components/schemas/NoteDto' meta: $ref: '#/components/schemas/EmptyMetaDto' '400': description: Validation failed. `error.param` names the field. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelopeDto' '401': description: Missing, invalid, expired or revoked credential. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelopeDto' '403': description: Credential lacks the scope, or the role lacks the permission. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelopeDto' '404': description: Resource not found in this location. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelopeDto' '429': description: Rate limit exceeded. See `X-RateLimit-*` and `Retry-After`. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelopeDto' security: - bearer: [] components: schemas: NoteCreateDto: type: object properties: content: type: string description: >- Note text (plain text; line breaks preserved). Up to 10,000 characters. maxLength: 10000 is_pinned: type: boolean description: Pin the note to the top of the timeline. default: false required: - content NoteDto: type: object properties: id: type: string description: Note id. entity_type: type: string enum: - business - deal description: Whether the note is attached to a business or a deal. entity_id: type: string description: Id of the business or deal the note belongs to. content: type: string description: Note text. is_pinned: type: boolean description: Pinned notes sort first. author: description: Who wrote it. allOf: - $ref: '#/components/schemas/NoteAuthorDto' created_at: type: string description: ISO 8601 UTC. updated_at: type: string description: ISO 8601 UTC. required: - id - entity_type - entity_id - content - is_pinned - author - created_at - updated_at EmptyMetaDto: type: object properties: {} ErrorEnvelopeDto: type: object properties: error: $ref: '#/components/schemas/PublicErrorDto' required: - error NoteAuthorDto: type: object properties: user_id: type: string nullable: true description: >- User id of the author, or null when written by an API key with no creator. user_name: type: string nullable: true description: 'Author display name: a team member or `API key "name"`.' required: - user_id - user_name PublicErrorDto: type: object properties: type: type: string enum: - validation_error - authentication_error - permission_error - not_found - conflict - rate_limit_error - api_error message: type: string description: Human-readable explanation, safe to show to an operator or an agent. code: type: string description: >- Stable machine-readable code, e.g. `missing_scope`, `duplicate_business`. param: type: string description: Request field the error refers to, when applicable. request_id: type: string description: Echo of the `X-Request-Id` header. Quote it when contacting support. required: - type - message - request_id securitySchemes: bearer: scheme: bearer bearerFormat: API key or JWT type: http description: API key (`nlmca_live_…`) or OAuth access token ```` ## Related topics - [Add a deal note](/api-reference/deals/add-a-deal-note.md) - [List business notes](/api-reference/businesses/list-business-notes.md) - [MCP server](/mcp/overview.md)