> ## Documentation Index > Fetch the complete documentation index at: https://docs.fuseai.com/llms.txt > Use this file to discover all available pages before exploring further. # Start an import (parse + suggested mapping) > Starts an import from a spreadsheet. Two intake shapes: a multipart request carrying the file (CSV/XLS/XLSX, ≤10MB — larger files go through `POST /business/imports/presign` first) or a JSON body naming a presigned upload's `importId`. Without a destination the call parses the file and answers 200 with the mapping-confirmation payload — `rowCount`, the detected `headers`, up to five `sampleRows`, and `suggestedMapping` (source header → standard field label such as `First Name`, `Email`, `Company`; null when nothing was suggested) — to confirm via `POST /business/imports/{importId}/commit`. With `listId` or `listName` (plus optional `mapping` and `enrich`) the import commits in the same call and answers 202 `{ import: { importId, listId, jobId } }`. Parsing spends no credits; enrichment chosen with `enrich` bills as `POST /business/lists/{listId}/enrich` does. Errors: - `400` `IMPORT_FILE_MISSING` — Neither a multipart file part nor an importId was sent. - `404` `IMPORT_NOT_FOUND` — importId does not decode to an upload of the token owner, or the uploaded object is gone. - `404` `LIST_NOT_FOUND` — One-call flow: the destination listId is unknown or not owned. - `409` `LIST_NAME_AMBIGUOUS` — One-call flow: more than one list carries listName — reference the destination by id. - `422` `IMPORT_FILE_UNSUPPORTED` — The multipart Content-Type is not CSV/XLS/XLSX, or the file could not be parsed. - `422` `IMPORT_FILE_TOO_LARGE` — Multipart file over 10MB, or a presigned object over 50MB. - `422` `IMPORT_FILE_EMPTY` — The file has no data rows. - `422` `LIST_NAME_RESERVED` — One-call flow: listName is a system/dynamic list title and cannot be a destination. - `422` `VALIDATION_FAILED` — Both listId and listName sent, an unknown body key, or an invalid enrich mode. - `429` `RATE_LIMITED` — The lists rate bucket (120 requests/minute, 10,000/day per token owner) is exhausted. Requires one of the following token scopes: lists. ## OpenAPI ````yaml /openapi.json post /business/imports openapi: 3.1.0 info: title: Fuse Business API version: 1.0.0 description: >- External API for lists, campaigns, prospect search and contacts. Authenticate with your API token as HTTP Basic. All paths are under /api/v1. servers: - url: https://api.tryfuse.ai/api/v1 description: Production security: - basicAuth: [] tags: - name: Lists - name: Custom columns - name: Smart columns - name: Exports - name: Campaigns - name: Knowledge hubs - name: Analytics - name: Website intent - name: Account - name: Prospect search - name: Campaign steps - name: Scheduled sends - name: Campaign templates - name: Agents - name: Research - name: Company search - name: Saved searches - name: Folders - name: Contacts paths: /business/imports: post: tags: - Lists summary: Start an import (parse + suggested mapping) description: >- Starts an import from a spreadsheet. Two intake shapes: a multipart request carrying the file (CSV/XLS/XLSX, ≤10MB — larger files go through `POST /business/imports/presign` first) or a JSON body naming a presigned upload's `importId`. Without a destination the call parses the file and answers 200 with the mapping-confirmation payload — `rowCount`, the detected `headers`, up to five `sampleRows`, and `suggestedMapping` (source header → standard field label such as `First Name`, `Email`, `Company`; null when nothing was suggested) — to confirm via `POST /business/imports/{importId}/commit`. With `listId` or `listName` (plus optional `mapping` and `enrich`) the import commits in the same call and answers 202 `{ import: { importId, listId, jobId } }`. Parsing spends no credits; enrichment chosen with `enrich` bills as `POST /business/lists/{listId}/enrich` does. Errors: - `400` `IMPORT_FILE_MISSING` — Neither a multipart file part nor an importId was sent. - `404` `IMPORT_NOT_FOUND` — importId does not decode to an upload of the token owner, or the uploaded object is gone. - `404` `LIST_NOT_FOUND` — One-call flow: the destination listId is unknown or not owned. - `409` `LIST_NAME_AMBIGUOUS` — One-call flow: more than one list carries listName — reference the destination by id. - `422` `IMPORT_FILE_UNSUPPORTED` — The multipart Content-Type is not CSV/XLS/XLSX, or the file could not be parsed. - `422` `IMPORT_FILE_TOO_LARGE` — Multipart file over 10MB, or a presigned object over 50MB. - `422` `IMPORT_FILE_EMPTY` — The file has no data rows. - `422` `LIST_NAME_RESERVED` — One-call flow: listName is a system/dynamic list title and cannot be a destination. - `422` `VALIDATION_FAILED` — Both listId and listName sent, an unknown body key, or an invalid enrich mode. - `429` `RATE_LIMITED` — The lists rate bucket (120 requests/minute, 10,000/day per token owner) is exhausted. Requires one of the following token scopes: lists. operationId: createImport requestBody: required: true content: application/json: schema: type: object properties: importId: type: string minLength: 8 maxLength: 800 description: >- The importId returned by POST /business/imports/presign, once the file has been PUT to its uploadUrl; omit when the file is sent as a multipart part of this request. listId: type: string description: >- 24-character hex id of an existing contact list to append the rows to; mutually exclusive with listName, and an unknown or non-owned id answers 404 LIST_NOT_FOUND. listName: type: string minLength: 1 maxLength: 255 description: >- Name of the destination contact list (1-255 characters): an existing list with this exact name (case-insensitive) is reused, otherwise it is created; mutually exclusive with listId. Two lists sharing the name answer 409 LIST_NAME_AMBIGUOUS and reserved system titles answer 422 LIST_NAME_RESERVED. mapping: type: object properties: {} description: >- Column mapping from source column header to target field, e.g. {"fname": "First Name"} (up to 200 entries). Each key is a column header spelled exactly as it appears in the file (the `headers` of the import preview). Each value is one of exactly these 21 target labels, spelled and cased exactly like this: Full Name, First Name, Last Name, LinkedIn URL, Company, Company Domain, Job Title, Job Level, Department, Industry, Country, State, City, Email, Phone — plus six aliases, each read only when the label it follows is missing or empty: Company Name (after Company), Mobile Phone (after Phone), Seniority then Level (after Job Level), and linkedinUrl then linkedin (after LinkedIn URL). Map to the primary label where you can. A label outside those 21 is ACCEPTED and then silently drops that column — no error, no custom column. Headers that already match a label case-insensitively (email, first_name, title, domain) need no entry, a header with no target carries null and is ignored — so the suggestedMapping from POST /business/imports can be sent back unchanged — and when two headers name the same target only the last one is used. enrich: type: string enum: - none - email - phone - phone_and_email - demographics description: >- Enrichment to run on the imported rows: none (default, rows saved exactly as uploaded), email, phone or phone_and_email (the enrichment waterfall, billed per contact processed) or demographics (resolve rows to canonical contacts, 2 credits per resolved contact). multipart/form-data: schema: type: object properties: file: type: string format: binary description: >- The spreadsheet to import (.csv or .xlsx). Any part name is accepted; the first non-empty file part is used. listId: type: string description: Destination list id. Omit to create a list from `listName`. listName: type: string description: Name for a new destination list when `listId` is omitted. enrich: type: string description: >- Enrichment to run on commit: none, email, phone, phone_and_email or demographics. required: - file responses: '200': description: Success headers: RateLimit-Limit: schema: type: integer description: Requests permitted in the current window. RateLimit-Remaining: schema: type: integer description: Requests remaining in the current window. RateLimit-Reset: schema: type: integer description: Seconds until the current window resets. content: application/json: schema: type: object required: - import properties: import: type: object required: - importId - filename - rowCount - headers - sampleRows - suggestedMapping properties: importId: type: string filename: type: - string - 'null' rowCount: type: integer headers: type: array items: type: string sampleRows: type: array items: type: object additionalProperties: true suggestedMapping: type: - object - 'null' additionalProperties: type: - string - 'null' example: import: importId: >- dXBsb2Fkcy82ODU0MGY4YmI1NWU5OTYyODE3MGM3NTcvZmU2NWZmZmEtNDllYi00ODk1LWE2YTgtOTBiNWI0N2I4YzhiLmNzdg filename: leads.csv rowCount: 1240 headers: - First Name - Last Name - Email - Company - Tel - Deal stage sampleRows: - First Name: Sam Last Name: Rivera Email: sam@brightpay.com Company: Brightpay Tel: '+13015023231' Deal stage: Discovery - First Name: Ada Last Name: Nwosu Email: ada@brightpay.com Company: Brightpay Tel: '+13015023232' Deal stage: Proposal suggestedMapping: First Name: First Name Last Name: Last Name Email: Email Company: Company Tel: Phone Deal stage: null '400': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '402': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '409': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '422': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '500': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' security: - basicAuth: [] components: schemas: Error: type: object properties: error: type: object properties: code: type: string message: type: string param: type: - string - 'null' doc_url: type: - string - 'null' request_id: type: - string - 'null' required: - code - message required: - error securitySchemes: basicAuth: type: http scheme: basic description: >- Your API token (`af_…`) as the Basic-auth username, with an empty password. ````