> ## 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. # Start a document upload > Two-step upload. **1.** Call this with the file’s name, type and MIME type: a hidden document row is created and a presigned URL is returned. **2.** `PUT` the raw file bytes to `upload_url` with the returned `headers` (`Content-Type` must match `mime_type`; no multipart, no auth header). **3.** Call `POST /documents/{document_id}/finalize` so the document becomes visible and, for bank statements, coverage is recomputed. The upload URL expires after about two hours; unfinalized rows stay hidden. Send an `Idempotency-Key` to retry safely. ## OpenAPI ````yaml /openapi/public-v1.json post /v1/deals/{dealId}/documents 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/deals/{dealId}/documents: post: tags: - Documents summary: Start a document upload description: >- Two-step upload. **1.** Call this with the file’s name, type and MIME type: a hidden document row is created and a presigned URL is returned. **2.** `PUT` the raw file bytes to `upload_url` with the returned `headers` (`Content-Type` must match `mime_type`; no multipart, no auth header). **3.** Call `POST /documents/{document_id}/finalize` so the document becomes visible and, for bank statements, coverage is recomputed. The upload URL expires after about two hours; unfinalized rows stay hidden. Send an `Idempotency-Key` to retry safely. operationId: documents_createUpload parameters: - name: dealId required: true in: path description: Deal id schema: type: string requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/CreateDocumentUploadDto' responses: '201': description: Created content: application/json: schema: type: object required: - data - meta properties: data: $ref: '#/components/schemas/DocumentUploadDto' 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' '409': description: Conflict (duplicate or idempotency key reuse). 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: CreateDocumentUploadDto: type: object properties: name: type: string description: >- File name including extension, e.g. `chase-aug-2026.pdf`. Path separators are stripped. maxLength: 255 type: type: string enum: - application - bank-statement - tax-return - voided-check - contract - drivers-license - ach-authorization - business-license - proof-of-ownership - utility-bill - other description: >- Document type. Use `bank-statement` for statements you want analyzed. mime_type: type: string description: >- MIME type of the file you will PUT, e.g. `application/pdf`, `image/jpeg`. Must match the `Content-Type` header of the upload. maxLength: 100 file_size: type: number description: >- Size in bytes, if known. Verified against the stored object on finalize. minimum: 1 required: - name - type - mime_type DocumentUploadDto: type: object properties: document_id: type: string description: >- Id of the pending document row. Use it for `POST /documents/{id}/finalize`. upload_url: type: string description: >- Presigned URL. Send the raw file bytes as the request body (no multipart). upload_method: type: string enum: - PUT description: HTTP method to use against `upload_url`. headers: type: object description: >- Headers to send with the PUT, e.g. `{ "Content-Type": "application/pdf", "x-upsert": "false" }`. additionalProperties: type: string expires_at: type: string description: >- When `upload_url` expires (ISO 8601, about 2 hours). Create a new upload if it lapses. required: - document_id - upload_url - upload_method - headers - expires_at EmptyMetaDto: type: object properties: {} ErrorEnvelopeDto: type: object properties: error: $ref: '#/components/schemas/PublicErrorDto' required: - error 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 - [Documents and uploads](/guides/documents-and-uploads.md) - [Finalize an upload](/api-reference/documents/finalize-an-upload.md) - [Authentication](/getting-started/authentication.md)