> ## Documentation Index > Fetch the complete documentation index at: https://api-docs.voicecheap.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Duplicate saved subtitles > Save a separate editable copy of subtitles without generating another transcript. Save a separate editable copy of subtitles without generating another transcript. ```http theme={null} POST https://api.voicecheap.ai/v1/actions/subtitles_history_duplicate ``` ## Authentication and permissions Send a VoiceCheap API key in this header. Authorization: Bearer with the same API key is also supported. OAuth access tokens are accepted only by MCP, not by this REST endpoint. Required permissions: `subtitles:write`. An active paid subscription is required. Permissions do not change team roles, resource ownership, media credits, or plan limits. ## Parameters Text value. Minimum length: 1. Maximum length: 160. Pattern: `^[A-Za-z0-9_-]+$`. Text value. Minimum length: 1. Maximum length: 2097152. JSON object. See the complete input schema for its nested fields. JSON object. See the complete input schema for its nested fields. Optional at the transport boundary: the server injects an identifier before validation when omitted. Supply your own stable UUID v4 to recover safely from a lost response. Format: "uuid". Pattern: `^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$`. The JSON Schema below preserves the exact field names, nested types, defaults, bounds, and accepted values exposed by discovery. Additional cross-field rules are listed in the operation notes. ```json theme={null} { "type": "object", "properties": { "historyId": { "type": "string", "minLength": 1, "maxLength": 160, "pattern": "^[A-Za-z0-9_-]+$" }, "currentSrtContent": { "type": "string", "minLength": 1, "maxLength": 2097152 }, "layoutOptions": { "type": "object", "properties": { "maxLinesPerCaption": { "anyOf": [ { "type": "number", "const": 1 }, { "type": "number", "const": 2 }, { "type": "number", "const": 3 } ] }, "maxCharactersPerLine": { "type": "integer", "minimum": 24, "maximum": 64 } }, "required": ["maxLinesPerCaption", "maxCharactersPerLine"], "additionalProperties": false }, "styleOptions": { "type": "object", "properties": { "fontFamily": { "type": "string", "enum": ["sans", "serif", "mono"] }, "fontSize": { "type": "string", "enum": ["small", "medium", "large"] }, "textColor": { "type": "string", "enum": ["white", "yellow", "cyan"] }, "backgroundStyle": { "type": "string", "enum": ["outline", "box", "shadow"] }, "position": { "type": "string", "enum": ["bottom", "middle"] } }, "required": ["fontFamily", "fontSize", "textColor", "backgroundStyle", "position"], "additionalProperties": false }, "requestId": { "description": "UUID v4 for this action. Reuse the same ID with identical arguments on retries.", "type": "string", "format": "uuid", "pattern": "^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$" } }, "required": ["historyId", "currentSrtContent"], "additionalProperties": false } ``` ## Idempotency Use a UUID v4 in requestId or the Idempotency-Key HTTP header for each mutation. Reuse the same identifier and identical arguments after a network failure. If both are supplied, they must match. Replaying a saved request does not repeat the operation or charge another monthly call. Failed or interrupted requests are not restarted automatically. Every mutation can return HTTP 202 when a retry finds the same request still running, even when its first execution is normally synchronous. If execution completed but resultStored is false, a retry returns HTTP 200 with saved request state instead of the original result. Retrieve the output through its domain history, result, or download action. ## Request examples Replace example resource identifiers and media keys with values returned for your account. Keep the request identifier stable when retrying the same mutation. ```bash cURL theme={null} curl --request POST 'https://api.voicecheap.ai/v1/actions/subtitles_history_duplicate' \ --header "x-api-key: $VOICECHEAP_API_KEY" \ --header 'Content-Type: application/json' \ --data '{"historyId":"history_20261016_001","currentSrtContent":"1\n00:00:00,000 --> 00:00:01,500\nHello world.\n","layoutOptions":{"maxLinesPerCaption":2,"maxCharactersPerLine":42},"styleOptions":{"fontFamily":"sans","fontSize":"medium","textColor":"white","backgroundStyle":"outline","position":"bottom"},"requestId":"13579bdf-2468-4ace-8bdf-0123456789ab"}' ``` ```javascript JavaScript theme={null} const input = { historyId: 'history_20261016_001', currentSrtContent: '1\n00:00:00,000 --> 00:00:01,500\nHello world.\n', layoutOptions: { maxLinesPerCaption: 2, maxCharactersPerLine: 42, }, styleOptions: { fontFamily: 'sans', fontSize: 'medium', textColor: 'white', backgroundStyle: 'outline', position: 'bottom', }, requestId: '13579bdf-2468-4ace-8bdf-0123456789ab', }; const response = await fetch('https://api.voicecheap.ai/v1/actions/subtitles_history_duplicate', { method: 'POST', headers: { 'x-api-key': process.env.VOICECHEAP_API_KEY, 'Content-Type': 'application/json', }, body: JSON.stringify(input), }); const body = await response.json(); if (!response.ok) throw new Error(body.code + ': ' + body.message); console.log(body); ``` ```python Python theme={null} import os import requests response = requests.post( "https://api.voicecheap.ai/v1/actions/subtitles_history_duplicate", headers={"x-api-key": os.environ["VOICECHEAP_API_KEY"]}, json={"historyId": "history_20261016_001", "currentSrtContent": "1\n00:00:00,000 --> 00:00:01,500\nHello world.\n", "layoutOptions": {"maxLinesPerCaption": 2, "maxCharactersPerLine": 42}, "styleOptions": {"fontFamily": "sans", "fontSize": "medium", "textColor": "white", "backgroundStyle": "outline", "position": "bottom"}, "requestId": "13579bdf-2468-4ace-8bdf-0123456789ab"}, timeout=120, ) body = response.json() if not response.ok: raise RuntimeError(f"{body.get('code')}: {body.get('message')}") print(body) ``` ## Response A successful first execution returns HTTP 200 with the operation result under data. A replay may return saved request state instead. The example shows one supported response, not every optional field. A new independently editable subtitle history ID starting at revision 1, with its normalized SRT and creation timestamp. ```json HTTP 200 theme={null} { "data": { "historyId": "history_20261016_copy", "revision": 1, "updatedAt": 1792152010000, "currentSrtContent": "1\n00:00:00,000 --> 00:00:01,500\nHello world.\n" }, "requestId": "13579bdf-2468-4ace-8bdf-0123456789ab" } ``` ```json HTTP 202 replay_running theme={null} { "data": { "requestId": "13579bdf-2468-4ace-8bdf-0123456789ab", "operation": "subtitles_history_duplicate", "createdAt": 1792144800000, "updatedAt": 1792144820000, "status": "running", "pollAfterSeconds": 5 }, "requestId": "13579bdf-2468-4ace-8bdf-0123456789ab" } ``` ```json HTTP 200 replay_completed_without_result theme={null} { "data": { "requestId": "13579bdf-2468-4ace-8bdf-0123456789ab", "operation": "subtitles_history_duplicate", "createdAt": 1792144800000, "updatedAt": 1792144820000, "status": "completed", "resultStored": false, "message": "The action completed. Retrieve its output from the corresponding history or resource action." }, "requestId": "13579bdf-2468-4ace-8bdf-0123456789ab" } ``` ## Result fields | Field | Description | | - | - | | `data.historyId` | New saved subtitle item, distinct from the input historyId. | | `data.revision` | 1 for the new editable copy. | | `data.updatedAt` | Unix timestamp in milliseconds for the newly created copy. | | `data.currentSrtContent` | Normalized supplied subtitle content. | ## Recover and poll this request Use the same identifier even after a lost connection. If resultStored is false, retrieve the output through the corresponding history, result, or download action. Never start a second generation merely to check progress. ```bash theme={null} curl --request POST 'https://api.voicecheap.ai/v1/actions/action_request_get' \ --header "x-api-key: $VOICECHEAP_API_KEY" \ --header 'Content-Type: application/json' \ --data '{"requestId":"13579bdf-2468-4ace-8bdf-0123456789ab","operation":"subtitles_history_duplicate"}' ``` ```json HTTP 200 theme={null} { "data": { "requestId": "13579bdf-2468-4ace-8bdf-0123456789ab", "operation": "subtitles_history_duplicate", "status": "completed", "createdAt": 1792144800000, "updatedAt": 1792144820000, "resultStored": true, "result": { "historyId": "history_20261016_copy", "revision": 1, "updatedAt": 1792152010000, "currentSrtContent": "1\n00:00:00,000 --> 00:00:01,500\nHello world.\n" } } } ``` ## Operation notes * Requires a paid subscription and the action permission. The actor's personal tool plan is rechecked at execution; saved tools and upload references belong to that actor, including when the credential is associated with a team. * A successful action uses one shared monthly API/MCP call. Beginner allows 500, Starter 5,000 and Creator 25,000 calls/month; Pro, Scale and Enterprise have no monthly ceiling. Per-minute limits still apply: 30, 60, 120, 180, 300 and 600 respectively. Tool generation allowances are separate. * Use a UUID v4 requestId, or an identical Idempotency-Key header, and retain the same action, ID and arguments on retries. A cached replay does not use another monthly call. * The input historyId selects the actor-owned source. Supply the full currentSrtContent to copy; it is not automatically taken from the saved source. * Cue validation and the 2 MiB bound match subtitles\_history\_update. Omitted layoutOptions/styleOptions use standard defaults. * A duplicate does not generate a new transcript, consume an uploaded source or use a daily tool generation. It does use one successful monthly integration call. ## Usage Each successful invocation consumes one monthly API/MCP call. Media credits and the operation's own generation allowances also apply. ## Errors | HTTP status | Code | Meaning or recovery | | - | - | - | | 400 | `CREDENTIAL_IN_QUERY` | Credentials were supplied in an access\_token or api\_key query parameter. Send credentials in headers. | | 400 | `IDEMPOTENCY_CONFLICT` | The header and body request IDs differ. | | 400 | `INVALID_REQUEST_ID` | requestId or Idempotency-Key is not a UUID v4. | | 400 | `VALIDATION_ERROR` | Arguments do not satisfy the action schema, or an unknown argument was supplied. | | 400 | `VIDEO_TO_SRT_HISTORY_INVALID_SRT` | SRT cue text or timestamp structure is invalid. | | 400 | `VIDEO_TO_SRT_HISTORY_OUTSIDE_MEDIA` | A cue ends beyond the recorded source duration plus its 0.5-second tolerance. | | 400 | `VIDEO_TO_SRT_HISTORY_OVERLAP` | At least two subtitle cues overlap. | | 400 | `VIDEO_TO_SRT_HISTORY_SRT_TOO_LARGE` | Edited SRT exceeds the 2 MiB UTF-8 limit. | | 401 | `API_KEY_EXPIRED` | The API key has expired. | | 401 | `INVALID_API_KEY` | Provide a valid, unexpired API key. | | 401 | `INVALID_CREDENTIAL` | The Authorization header is malformed or conflicts with x-api-key. | | 401 | `MISSING_CREDENTIAL` | No usable header credential was supplied, or it exceeded 4096 characters. | | 401 | `USER_NOT_FOUND` | The credential's account no longer exists. | | 403 | `ACCOUNT_UNAVAILABLE` | The acting or billing account is unavailable or being deleted. | | 403 | `AMBIGUOUS_TEAM_API_KEY` | The credential's user belongs to more than one team, so the billing context is ambiguous. | | 403 | `INSUFFICIENT_SCOPE` | The API key or MCP connection lacks the required action permission. | | 403 | `INTEGRATION_PLAN_UNSUPPORTED` | The account's integration limits could not be verified. | | 403 | `PAID_SUBSCRIPTION_REQUIRED` | The authenticated actor no longer has a paid subscription when this tool action executes. | | 403 | `SUBSCRIPTION_REQUIRED` | Use an active paid subscription. | | 403 | `TEAM_OWNER_NOT_FOUND` | The effective team owner account could not be found. | | 404 | `VIDEO_TO_SRT_HISTORY_NOT_FOUND` | The actor-owned editable subtitle history item does not exist. | | 409 | `CONCURRENT_ACTION_LIMIT_REACHED` | This account already has 10 integration actions running. Poll an existing request before starting another. | | 409 | `IDEMPOTENCY_CONFLICT` | Reuse an identifier only with the same operation and arguments. | | 429 | `INTEGRATION_MONTHLY_LIMIT_REACHED` | Used and pending calls have reached the shared monthly API/MCP allowance. | | 429 | `INTEGRATION_RATE_LIMIT_REACHED` | The account has reached its per-minute integration limit; inspect retryAfterSeconds. | | 500 | `INTERNAL_ERROR` | Check saved request state and resource history before deciding to retry a mutation. | | 503 | `ACTION_RESULT_UNAVAILABLE` | The action ran but request-result persistence could not be confirmed. Poll the same action and requestId and inspect resource history before starting another write. | | 503 | `SERVER_RESTARTING` | The server is restarting. Retry shortly and keep the same request identifier for a mutation. | ```json theme={null} { "code": "INSUFFICIENT_SCOPE", "message": "This credential does not permit the requested action.", "status": 403, "details": { "requiredScopes": ["subtitles:write"] } } ``` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.