> ## Documentation Index > Fetch the complete documentation index at: https://developer.sandbox.co.in/llms.txt > Use this file to discover all available pages before exploring further. # Generate OTP > generate otp to download csi file ## OpenAPI ````yaml api-reference/tds/compliance/openapi.json POST /tds/compliance/csi/otp openapi: 3.0.1 info: title: compliance description: >- Tax Deducted at Source (TDS) is an indirect method of collecting Income Tax. TDS is based on the principle of “Pay as you earn” which is beneficial for both the Government and the taxpayer. It is where a person making a payment of specified nature is liable to deduct tax at a prescribed rate. This ensures continuous revenue for the Government by way of Tax Deducted at the Source. The Payer making a payment is also responsible to deposit TDS with the Income Tax Department within a specified date and file a TDS Return. Once filed, the deposited amount will be shown in the Payee's Form 26AS which they can then use to claim tax credits when filing ITR. However, staying TDS compliant can be a hassle for businesses, as they are required to : 1. Deduct TDS from payments that are liable for TDS Deduction at an appropriate rate. 2. Deposit TDS to Government before the due date. 3. File TDS Returns on a Quarterly basis. 4. Issue a TDS Certificate by the deductor to the deductee. Organizations deducting TDS have to remain compliant with each of the steps. Failure to do so results in TDS Penalties by Authorities. Sandbox provides TDS Compliance APIs to help you automate end-to-end TDS compliance. version: 1.0.0 servers: - url: https://test-api.sandbox.co.in - url: https://api.sandbox.co.in security: [] paths: /tds/compliance/csi/otp: post: tags: - Download CSI summary: Generate OTP parameters: - name: authorization in: header description: JWT access token required: true example: '{{access_token}}' schema: type: string - name: x-api-key in: header description: API key for identification required: true example: '{{api_key}}' schema: type: string - name: x-api-version in: header description: '' required: false example: '' schema: type: string requestBody: content: application/json: schema: type: object properties: '@entity': type: string enum: - in.co.sandbox.tds.compliance.deductors.otp.request tan: description: >- TAN of deductor/collector. Regular Expression: [A-Z]{4}[0-9]{5}[A-Z]{1} pattern: '[A-Z]{4}[0-9]{5}[A-Z]{1}' type: string mobile_number: description: 'Mobile Number to send the OTP. Pattern: [1-9]{1}[0-9]{9}' pattern: '[1-9]{1}[0-9]{9}' type: string from: description: >- Date from which challan details are to be fetched. Value in EPOCH timestamp type: integer to: description: >- Date till which challan details are to be fetched. Value in EPOCH timestamp type: integer consent: description: >- Consent of the end-user to get their information. Possible values: Y or y type: string reason: description: 'Indicate the purpose. Min length: 20 characters' type: string required: - '@entity' - tan - mobile_number - from - to - consent - reason examples: 200 - Success: value: '@entity': in.co.sandbox.tds.compliance.deductors.otp.request tan: AHMA09719B mobile_number: '1234567890' from: 1722450600000 to: 1730313000000 consent: 'Y' reason: TDS Return summary: 200 - Success 200 Invalid TAN: value: '@entity': in.co.sandbox.tds.compliance.deductors.otp.request tan: AABC23456D mobile_number: '1234567890' from: 1722450600000 to: 1730313000000 consent: 'Y' reason: TDS Return summary: 200 Invalid TAN 200 OTP already generated: value: '@entity': in.co.sandbox.tds.compliance.deductors.otp.request tan: PDES03028E mobile_number: '1234567890' from: 1722450600000 to: 1730313000000 consent: 'Y' reason: TDS Return summary: 200 OTP already generated 422 - Unprocessable Entity: value: '@entity': in.co.sandbox.tds.compliance.deductors.otp.request tan: DABC2345DD mobile_number: '1234567890' from: 1722450600000 to: 1730313000000 consent: 'Y' reason: TDS Return summary: 422 - Unprocessable Entity responses: '200': description: 200 - OK content: application/json: schema: type: object properties: timestamp: type: integer transaction_id: type: string data: type: object properties: '@entity': type: string tan: type: string mobile_number: type: string from: type: integer to: type: integer reference_id: type: string message: type: string code: type: integer examples: 200 - Success: summary: 200 - Success value: timestamp: 1731669661517 transaction_id: 166148b8-25e3-4ef2-b052-5a27098ebb0e data: '@entity': in.co.sandbox.tds.compliance.deductors.otp.response tan: AHMA09719B mobile_number: '1234567890' from: 1722450600000 to: 1730313000000 reference_id: FOS005981930273 message: OTP sent successfully code: 200 200 Invalid TAN: summary: 200 Invalid TAN value: code: 200 timestamp: 1763362637000 transaction_id: e2b9145f-69d5-4bbe-a6de-be6fc08b426f data: '@entity': in.co.sandbox.tds.compliance.deductors.csi.response message: Invalid TAN 200 OTP already generated: summary: 200 OTP already generated value: code: 200 timestamp: 1763362637000 transaction_id: e2b9145f-69d5-4bbe-a6de-be6fc08b426f data: '@entity': in.co.sandbox.tds.compliance.deductors.csi.response message: OTP generated for this TAN, please try after 30 seconds headers: {} '422': description: 422 - Unprocessable Entity content: application/json: schema: type: object properties: code: type: integer timestamp: type: integer transaction_id: type: string message: type: string examples: 422 - Unprocessable Entity: summary: 422 - Unprocessable Entity value: code: 422 timestamp: 1763362637000 transaction_id: e2b9145f-69d5-4bbe-a6de-be6fc08b426f message: Invalid TAN pattern headers: {} deprecated: false security: [] ````