> ## Documentation Index > Fetch the complete documentation index at: https://www.presolve.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Mint a presigned upload session > Create-or-replace presigned upload (max 2 GiB). Complete with POST /document-uploads/{uploadId}/complete. Requires the `documents:write` scope. Mutations require an `X-Idempotency-Key` header (responses are stored for replay; reusing a key with a different request returns 409 `IDEMPOTENCY_CONFLICT`). Requires `If-Match: ""`; a stale revision returns 409 `STALE_REVISION` and successful responses carry an `ETag`. Rate tier: `upload`. ## OpenAPI ````yaml /openapi.json post /api/v1/document-uploads openapi: 3.1.0 info: title: Grand Charter Public API version: 1.0.0 description: >- Org-scoped integration API for the Grand Charter legal platform. Authenticate every request with an integration API key in the `x-api-key` header. Keys are created in the attorney portal under **Settings → Integrations → API Credentials** (or by platform admins) and carry an explicit list of scopes; each operation below names its required scope (`x-required-scope`). Conventions: JSON bodies/responses in camelCase; money in integer cents; ISO-8601 UTC timestamps; keyset cursor pagination (`after`, `limit` → `nextCursor`); errors use `{ success: false, error, code }`. Idempotency: most mutations require an `X-Idempotency-Key` header — each operation description below says so explicitly. Exceptions that do NOT consume the header (retrying them can create duplicates): `POST /leads`, `PATCH /leads/{leadId}`, and `PATCH /cases/{caseId}`. servers: - url: https://www.presolve.com description: Production security: - integrationApiKey: [] tags: - name: Platform - name: Org & Team - name: Cases - name: Leads - name: Clients - name: Contacts - name: Documents - name: Notes - name: Tasks - name: Calendar - name: Deadlines - name: Intake - name: E-Sign - name: Billing - name: Settlement Funds - name: Referrals - name: Communications - name: Medical - name: Reports & Exports - name: Events & Webhooks paths: /api/v1/document-uploads: post: tags: - Documents summary: Mint a presigned upload session description: >- Create-or-replace presigned upload (max 2 GiB). Complete with POST /document-uploads/{uploadId}/complete. Requires the `documents:write` scope. Mutations require an `X-Idempotency-Key` header (responses are stored for replay; reusing a key with a different request returns 409 `IDEMPOTENCY_CONFLICT`). Requires `If-Match: ""`; a stale revision returns 409 `STALE_REVISION` and successful responses carry an `ETag`. Rate tier: `upload`. operationId: post_documentUploads parameters: - name: X-Idempotency-Key in: header required: true description: >- Stable caller-chosen key (max 200 chars) making the mutation safely retryable. schema: type: string maxLength: 200 - name: If-Match in: header required: true description: Current entity revision, quoted (e.g. `"3"`), from the last ETag. schema: type: string requestBody: required: true content: application/json: schema: oneOf: - type: object properties: operation: type: string const: create caseId: type: string minLength: 1 maxLength: 200 folderId: type: - string - 'null' minLength: 1 maxLength: 200 name: type: string minLength: 1 maxLength: 255 mimeType: type: string minLength: 1 maxLength: 255 sizeBytes: type: integer minimum: -9007199254740991 maximum: 9007199254740991 sha256: type: string pattern: ^[A-Za-z0-9+/]{43}=$ required: - operation - caseId - name - mimeType - sizeBytes - sha256 additionalProperties: false - type: object properties: operation: type: string const: replace documentId: type: string minLength: 1 maxLength: 200 mimeType: type: string minLength: 1 maxLength: 255 sizeBytes: type: integer minimum: -9007199254740991 maximum: 9007199254740991 sha256: type: string pattern: ^[A-Za-z0-9+/]{43}=$ required: - operation - documentId - mimeType - sizeBytes - sha256 additionalProperties: false responses: '201': description: '{ success: true, upload: { id, url, ... } }' content: application/json: schema: $ref: '#/components/schemas/SuccessEnvelope' '400': description: Validation failed (VALIDATION_FAILED). content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Missing, invalid, or expired API key (UNAUTHORIZED). content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '403': description: API key lacks the required scope (FORBIDDEN). content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '404': description: Resource not found in the caller’s organization (NOT_FOUND). content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '409': description: >- Conflict: invalid state transition, duplicate entry, stale revision, or idempotency conflict. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '429': description: Rate limit exceeded (RATE_LIMITED). Honor Retry-After. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - integrationApiKey: [] components: schemas: SuccessEnvelope: type: object properties: success: type: boolean const: true required: - success additionalProperties: {} ErrorResponse: type: object properties: success: type: boolean const: false error: type: string description: >- Human-readable error message. 5xx responses are always scrubbed to "Internal server error". code: type: string description: >- Stable machine-readable error code (ErrorCode), e.g. UNAUTHORIZED, FORBIDDEN, VALIDATION_FAILED, NOT_FOUND, INVALID_STATE_TRANSITION, DUPLICATE_ENTRY, STALE_REVISION, IDEMPOTENCY_IN_PROGRESS, IDEMPOTENCY_CONFLICT, RATE_LIMITED, INTERNAL_ERROR. required: - success - error - code securitySchemes: integrationApiKey: type: apiKey in: header name: x-api-key description: >- Org-issued integration API key (service account credential). The plaintext secret is shown once at creation. ````