> ## Documentation Index > Fetch the complete documentation index at: https://docs.tagada.io/llms.txt > Use this file to discover all available pages before exploring further. # Apply a subscription discount in place > Give a subscription 1–99 percent off its next 1–24 rebills, or every rebill with rebills: null. A trial-end charge counts as rebill 1. No charge occurs now. With retentionOfferId (1–100 characters), source is retention; otherwise source is manual. replaceRunning defaults to false: a running discount answers 409. With true, the old row ends as replaced and the new one starts. Supports Idempotency-Key. An unknown subscription or one of another account answers 404; a store without Subscriptions V3 answers 412 because its rebill does not read discounts; a canceled subscription answers 409. An open renewal charge answers 409 (RENEWAL_IN_PROGRESS); retry after it settles. ## OpenAPI ````yaml /openapi.json post /api/public/v1/subscriptions/apply-discount openapi: 3.0.3 info: title: TagadaPay API description: >- # TagadaPay API Documentation Welcome to the TagadaPay API. This REST API lets you process payments, manage subscriptions, handle customers, deploy plugins, and orchestrate checkout funnels — all programmatically. ## Authentication Authenticate every request with a Bearer token. Get your API key from the [TagadaPay Dashboard](https://app.tagada.io). ``` Authorization: Bearer your-api-key ``` All requests must be made over HTTPS with `Content-Type: application/json`. ## Rate Limits | Plan | Requests/min | Burst | |------|-------------|-------| | Standard | 100 | 150 | | Premium | 500 | 750 | Exceeding the limit returns `429 Too Many Requests`. ## Errors | Code | Meaning | |------|---------| | 400 | Bad request — invalid parameters | | 401 | Unauthorized — missing or invalid API key | | 403 | Forbidden — insufficient permissions | | 404 | Not found | | 409 | Conflict | | 429 | Rate limited | | 500 | Server error | ## Support - Email: api-support@tagada.io - Docs: [docs.tagadapay.com](https://docs.tagadapay.com) version: 1.0.0 servers: - url: https://api.tagada.io/ description: Production - url: https://api.tagada.dev/ description: Sandbox / Development security: - bearerAuth: [] tags: - name: auth description: Test your API key and verify authentication. - name: stores description: Create and manage stores within your account. - name: products description: Create products with variants, prices, and currency options. - name: customers description: Manage customer records, addresses, and payment instruments. - name: orders description: List and retrieve orders with line items, payments, and metadata. - name: payments description: Process, list, refund, void, and dispute payments. - name: subscriptions description: >- Create and manage recurring subscriptions — billing, cancellation, rebilling, and processor changes. - name: payment-flows description: Configure payment routing strategies with cascading processor fallbacks. - name: payment-instruments description: >- Manage stored payment methods — cards, bank accounts, and tokenized instruments. - name: processors description: List connected payment processors (Stripe, NMI, Checkout.com, etc.). - name: promotions description: Create and manage discount promotions with rules and conditions. - name: promotion-codes description: Generate and manage reusable promotion/coupon codes. - name: block-rules description: >- Configure fraud prevention rules to block transactions by IP, email, card BIN, country, etc. - name: webhooks description: Register webhook endpoints to receive real-time event notifications. - name: events description: Query application events, statistics, and audit logs. - name: domains description: Add, verify, and manage custom domains for your checkout and funnels. - name: funnels description: >- Create and manage checkout funnels with routing, A/B testing, and CDN deployment. - name: funnel-sessions description: Retrieve funnel session data for analytics and debugging. - name: funnel-tracking description: Track funnel step events for conversion analytics. - name: plugins description: Deploy, manage, and configure checkout plugins. - name: plugins-v2 description: >- V2 plugin system — deploy, mount, split-test, fork, promote, and manage plugin instances. - name: checkout description: >- Initialize checkout sessions and process payments through the hosted checkout. - name: 3ds description: >- 3D Secure authentication — create sessions, authenticate, and handle challenges. - name: builder description: Generate and validate builder session tokens for the visual page editor. - name: health description: API health check endpoint. paths: /api/public/v1/subscriptions/apply-discount: post: tags: - subscriptions summary: Apply a subscription discount in place description: >- Give a subscription 1–99 percent off its next 1–24 rebills, or every rebill with rebills: null. A trial-end charge counts as rebill 1. No charge occurs now. With retentionOfferId (1–100 characters), source is retention; otherwise source is manual. replaceRunning defaults to false: a running discount answers 409. With true, the old row ends as replaced and the new one starts. Supports Idempotency-Key. An unknown subscription or one of another account answers 404; a store without Subscriptions V3 answers 412 because its rebill does not read discounts; a canceled subscription answers 409. An open renewal charge answers 409 (RENEWAL_IN_PROGRESS); retry after it settles. operationId: post-api-public-v1-subscriptions-apply-discount parameters: - name: Idempotency-Key in: header schema: type: string description: >- Reuse the same key and body to replay the original response after a lost response. requestBody: required: true content: application/json: schema: type: object properties: subscriptionId: type: string minLength: 1 percent: type: integer minimum: 1 maximum: 99 rebills: type: integer minimum: 1 maximum: 24 nullable: true retentionOfferId: type: string minLength: 1 maxLength: 100 replaceRunning: type: boolean default: false required: - subscriptionId - percent - rebills additionalProperties: false examples: nextRebill: summary: Half off the next charge, replacing any running offer value: subscriptionId: sub_123 percent: 50 rebills: 1 retentionOfferId: nextmonth_50off replaceRunning: true lifetime: summary: Half off every rebill value: subscriptionId: sub_123 percent: 50 rebills: null responses: '200': description: Successful response content: application/json: schema: type: object properties: subscriptionId: type: string discount: type: object properties: id: type: string percent: type: number rebillsLeft: type: number nullable: true rebillsGranted: type: number nullable: true rebillsUsed: type: number nullable: true source: type: string enum: - retention - manual addedBy: type: object properties: name: type: string nullable: true email: type: string nullable: true required: - name - email additionalProperties: false nullable: true createdAt: type: string format: date-time endedAt: type: string format: date-time nullable: true endReason: type: string enum: - exhausted - replaced - removed - subscription_canceled nullable: true required: - id - percent - rebillsLeft - rebillsGranted - rebillsUsed - source - addedBy - createdAt - endedAt - endReason additionalProperties: false required: - subscriptionId - discount additionalProperties: false examples: success: summary: The running discount value: subscriptionId: sub_123 discount: id: sdisc_123 percent: 50 rebillsLeft: 1 rebillsGranted: 1 rebillsUsed: 0 source: retention addedBy: null createdAt: '2026-10-30T10:30:00.000Z' endedAt: null endReason: null default: $ref: '#/components/responses/error' security: - bearerAuth: [] components: responses: error: description: Error response content: application/json: schema: type: object properties: message: type: string code: type: string issues: type: array items: type: object properties: message: type: string required: - message additionalProperties: false required: - message - code additionalProperties: false securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: JWT description: 'Enter your API key as: `Bearer your-api-key`' ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.