> ## Documentation Index > Fetch the complete documentation index at: https://casparser.in/docs/llms.txt > Use this file to discover all available pages before exploring further. # Connect Email Provider (Initiate OAuth) > Initiate OAuth flow to connect user's email inbox. Returns an `oauth_url` that you should redirect the user to. After authorization, they are redirected back to your `redirect_uri` with the following query parameters: **On success:** - `inbox_token` - Encrypted token to store client-side - `email` - Email address of the connected account - `state` - Your original state parameter (for CSRF verification) **On error:** - `error` - Error code (e.g., `access_denied`, `token_exchange_failed`) - `state` - Your original state parameter **Store the `inbox_token` client-side** and use it for all subsequent inbox API calls. ## OpenAPI ````yaml /api-reference/openapi.yaml post /v4/inbox/connect openapi: 3.1.0 info: title: CAS Parser - Track Portfolios from CDSL, NSDL, CAMS, KFintech description: >- API for parsing and analyzing CAS (Consolidated Account Statement) PDF files from NSDL, CDSL, and CAMS/KFintech, with a unified response format version: 4.0.0 contact: name: Sameer Kumar email: sameer@casparser.in servers: - url: https://api.casparser.in description: Production server - url: https://portfolio-parser.api.casparser.in description: Legacy production server (still supported) - url: http://localhost:5000 description: Local development server security: [] tags: - name: CAS Parser description: Endpoints for parsing CAS PDF files from different sources. - name: CAS Generator description: Endpoints for generating new CAS documents via email mailback (KFintech). - name: CAS Fetch description: | Endpoints for fetching CAS documents with instant download. Currently supports CDSL via OTP authentication. - name: Email Import description: > Endpoints for importing CAS files directly from user email inboxes. **Supported Providers:** Gmail (more coming soon) **How it works:** 1. Call `POST /v4/inbox/connect` to get an OAuth URL 2. Redirect user to the OAuth URL for consent 3. User is redirected back to your `redirect_uri` with an encrypted `inbox_token` 4. Use the token to list/fetch CAS files from their inbox (`/v4/inbox/cas`) 5. Files are uploaded to temporary cloud storage (URLs expire in 24 hours) **Security:** - Read-only access (we cannot send emails) - Tokens are encrypted with server-side secret - User can revoke access anytime via `/v4/inbox/disconnect` - name: Inbound Email description: > Create dedicated inbound email addresses for investors to forward their CAS statements. **Use Case:** Your app wants to collect CAS statements from users without requiring OAuth or file upload. **How it works:** 1. Call `POST /v4/inbound-email` to create a unique inbound email address 2. Display this email to your user: "Forward your CAS statement to ie_xxx@import.casparser.in" 3. When user forwards a CAS email, we verify sender authenticity (SPF/DKIM) and call your webhook 4. Your webhook receives email metadata + attachment download URLs **Sender Validation:** - Only emails from verified CAS authorities are processed: - CDSL: `eCAS@cdslstatement.com` - NSDL: `NSDL-CAS@nsdl.co.in` - CAMS: `donotreply@camsonline.com` - KFintech: `samfS@kfintech.com` - Emails failing SPF/DKIM/DMARC are rejected - Forwarded emails must contain the original sender in headers **Billing:** 0.2 credits per successfully processed valid email - name: Contract Note Parser description: >- Endpoints for parsing Contract Note PDF files from various SEBI brokers like Zerodha, Groww, Upstox, ICICI etc. - name: Authorization description: | Endpoints for checking API quota and credits usage. These endpoints help you monitor your API usage and remaining quota. - name: Portfolio Connect description: > Endpoints for managing access tokens for the Portfolio Connect SDK. Use these to generate short-lived `at_` prefixed tokens that can be safely passed to frontend applications. Access tokens can be used in place of API keys on all v4 endpoints. - name: Agent Auth description: > Endpoints for coding agents to obtain API keys via a browser-based approval flow. **How it works:** 1. Agent generates a random token locally (e.g. `openssl rand -hex 32`). No API call needed. 2. Agent asks the user to open `https://app.casparser.in/agent-auth?token=&client_name=` 3. User signs in via the browser and clicks Approve. 4. Agent polls `GET /v1/agent-auth/token/{token}` every 5 seconds until the key is delivered. **Security:** - Token must be 16-128 characters (recommended: 64 hex chars / 256 bits) - Approved keys are delivered once (one-shot) and then deleted - Tokens expire after 10 minutes if not approved - name: KYC description: > Endpoints for verifying KYC (Know Your Customer) status of Indian investors. **Data source:** CVL KRA public inquiry portal (cvlkra.com), which aggregates records from all five SEBI-registered KRAs: CVL, NDML, CAMS, Karvy, and KFin. **Status normalization:** Raw CVL portal strings are normalized into clean enums. See the `kyc_status` property on `KycPanStatusResponse` for the full list. **Credits:** 0.5 per successful lookup. Failed lookups are not billed. paths: /v4/inbox/connect: post: tags: - Email Import summary: Connect Email Provider (Initiate OAuth) description: > Initiate OAuth flow to connect user's email inbox. Returns an `oauth_url` that you should redirect the user to. After authorization, they are redirected back to your `redirect_uri` with the following query parameters: **On success:** - `inbox_token` - Encrypted token to store client-side - `email` - Email address of the connected account - `state` - Your original state parameter (for CSRF verification) **On error:** - `error` - Error code (e.g., `access_denied`, `token_exchange_failed`) - `state` - Your original state parameter **Store the `inbox_token` client-side** and use it for all subsequent inbox API calls. operationId: inboxConnect requestBody: required: true content: application/json: schema: type: object required: - redirect_uri properties: redirect_uri: type: string format: uri description: >- Your callback URL to receive the inbox_token (must be http or https) example: https://yourapp.com/oauth-callback state: type: string description: State parameter for CSRF protection (returned in redirect) example: abc123 responses: '200': description: OAuth URL generated successfully content: application/json: schema: type: object properties: status: type: string example: success oauth_url: type: string format: uri description: Redirect user to this URL to start OAuth flow example: https://accounts.google.com/o/oauth2/v2/auth?client_id=... expires_in: type: integer description: Seconds until the OAuth URL expires (typically 10 minutes) example: 600 '400': description: Invalid or missing redirect_uri '401': $ref: '#/components/responses/Unauthorized' security: - ApiKeyAuth: [] components: responses: Unauthorized: description: Unauthorized. This can happen if the `x-api-key` header is missing. content: application/json: schema: $ref: '#/components/schemas/AuthErrorResponse' example: status: error msg: >- Authentication failed: API key is missing. Please provide a valid API key in the x-api-key header. schemas: AuthErrorResponse: type: object required: - status - msg properties: status: type: string description: The status of the error. example: error msg: type: string description: A descriptive message explaining the error. example: 'Authentication failed: API key is missing.' securitySchemes: ApiKeyAuth: type: apiKey in: header name: x-api-key description: | Your API key for authentication. Use `sandbox-with-json-responses` as Sandbox key. ````