{"openapi":"3.1.0","info":{"title":"POST /api/v1/billing/migrate-from-grandfathered","version":"1.0.0","description":"Migrate grandfathered account to a paid plan"},"servers":[{"url":"https://api.ondayzero.com","description":"Production"}],"paths":{"/api/v1/billing/migrate-from-grandfathered":{"post":{"tags":["billing"],"summary":"Migrate grandfathered account to a paid plan","description":"Create a Stripe Checkout session to move from a grandfathered plan to a paid plan.\n\n**Request Body:**\n- `target_plan`: Plan tier to migrate to (`self_directed` or `managed`)\n- `success_url`: Redirect URL after successful payment\n- `cancel_url`: Redirect URL if checkout is canceled\n\n**Prerequisites:**\n- Business must currently be on the `grandfathered` plan tier\n\n**Effect:**\n- Creates a Stripe Checkout session\n- On payment completion, `plan_tier` is updated to the target plan\n\n**Returns:** Checkout URL and session ID.","operationId":"migrate_from_grandfathered","parameters":[{"name":"authorization","in":"header","required":false,"schema":{"anyOf":[{"type":"string"},{"type":"null"}],"title":"Authorization"}},{"name":"x-business-id","in":"header","required":false,"schema":{"anyOf":[{"type":"string"},{"type":"null"}],"title":"X-Business-Id"}}],"requestBody":{"required":true,"content":{"application/json":{"schema":{"$ref":"#/components/schemas/GrandfatheredMigrateRequest"}}}},"responses":{"201":{"description":"Successful Response","content":{"application/json":{"schema":{"$ref":"#/components/schemas/SuccessEnvelope_MigrateFromGrandfatheredResponse_"}}}},"400":{"description":"Bad Request - Invalid input","content":{"application/json":{"example":{"error":"validation_error","message":"Validation failed: due_date: Input should be a valid date","errors":{"due_date":"Input should be a valid date"},"code":"GEN_002","request_id":"3f0e7c2a-9b4d-4e1a-8c6f-2d5b7a1e9c30"},"schema":{"$ref":"#/components/schemas/ErrorResponse"}}}},"403":{"description":"Forbidden - Insufficient permissions","content":{"application/json":{"example":{"error":"forbidden","message":"You don't have permission to access this resource","code":"AUTH_002","request_id":"3f0e7c2a-9b4d-4e1a-8c6f-2d5b7a1e9c30"},"schema":{"$ref":"#/components/schemas/ErrorResponse"}}}},"422":{"description":"Validation Error","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorResponse"},"example":{"error":"validation_error","message":"Validation failed: amount: Input should be a valid integer","errors":{"amount":"Input should be a valid integer"},"code":"GEN_002","request_id":"3f0e7c2a-9b4d-4e1a-8c6f-2d5b7a1e9c30"}}}},"401":{"description":"Unauthorized - Missing or expired token, an MCP OAuth token used against the REST API, or no access to this business","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorResponse"},"example":{"error":"unauthorized","message":"Authentication required","code":"AUTH_001","request_id":"3f0e7c2a-9b4d-4e1a-8c6f-2d5b7a1e9c30"}}}}},"x-fastapi-operation-id":"migrate_from_grandfathered_api_v1_billing_migrate_from_grandfathered_post"}}},"components":{"schemas":{"GrandfatheredMigrateRequest":{"properties":{"target_plan":{"type":"string","title":"Target Plan","description":"Target plan tier: 'self_directed' or 'managed'."},"success_url":{"type":"string","title":"Success Url","description":"URL to redirect after successful payment."},"cancel_url":{"type":"string","title":"Cancel Url","description":"URL to redirect if checkout is canceled."},"billing_interval":{"type":"string","enum":["month","year"],"title":"Billing Interval","description":"Billing cadence: 'month' or discounted annual 'year'.","default":"month"}},"type":"object","required":["target_plan","success_url","cancel_url"],"title":"GrandfatheredMigrateRequest"},"MigrateFromGrandfatheredResponse":{"properties":{"checkout_url":{"type":"string","title":"Checkout Url"},"session_id":{"type":"string","title":"Session Id"}},"additionalProperties":true,"type":"object","required":["checkout_url","session_id"],"title":"MigrateFromGrandfatheredResponse","description":"Response for ``migrate_from_grandfathered``."},"SuccessEnvelope_MigrateFromGrandfatheredResponse_":{"properties":{"success":{"type":"boolean","title":"Success","default":true},"message":{"anyOf":[{"type":"string"},{"type":"null"}],"title":"Message"},"code":{"anyOf":[{"type":"string"},{"type":"null"}],"title":"Code"},"data":{"anyOf":[{"$ref":"#/components/schemas/MigrateFromGrandfatheredResponse"},{"type":"null"}]}},"additionalProperties":true,"type":"object","title":"SuccessEnvelope[MigrateFromGrandfatheredResponse]"},"ErrorResponse":{"title":"ErrorResponse","type":"object","description":"Envelope returned by every non-2xx response. Branch on `code` (stable) rather than `message` (human-readable, may change).","required":["error","message","code"],"properties":{"error":{"type":"string","description":"Error category: `validation_error`, `unauthorized`, `forbidden`, `not_found`, `conflict`, `rate_limited`, `server_error`, or `service_unavailable`."},"message":{"type":"string","description":"Human-readable explanation, safe to show to end users."},"code":{"type":"string","description":"Stable machine-readable code in `CATEGORY_NNN` form (e.g. `NOT_FOUND_006`, `AUTH_010`, `GEN_002`)."},"request_id":{"type":"string","description":"Correlation id for support requests. Echoes the `x-request-id` request header when one was supplied."},"errors":{"type":"object","additionalProperties":{"type":"string"},"description":"Field-level validation messages keyed by field name. Present on 400/422 validation failures only."}}}},"securitySchemes":{"BearerAuth":{"type":"http","scheme":"bearer","bearerFormat":"API Token","description":"API token authentication. Format: `Bearer dz_...`"}}},"security":[{"BearerAuth":[]}]}