> ## Documentation Index > Fetch the complete documentation index at: https://docs.aropay.aro.media/llms.txt > Use this file to discover all available pages before exploring further. # Export wallet key > **Session-only.** Export a custodial wallet's private key as a passphrase-encrypted `.nota` envelope (PBKDF2-SHA256 with 310,000 iterations + AES-256-GCM, applied server-side; the plaintext key never leaves the platform). Only custodial wallets can be exported. ## OpenAPI ````yaml /api-reference/openapi.yaml post /wallets/{id}/export openapi: 3.1.0 info: title: AroPay API version: 1.0.0 description: | The AroPay API for orchestrating sealed, private payments on public ledgers, built on the Aro Confidential Rails (Zama Protocol FHE). The current deployment is an MVP sandbox for B2B users on Ethereum Sepolia, with Mainnet to follow. Every response (except the flat Sandbox probes) uses the shared envelope: `{ "ok": true, "data": … }` on success and `{ "ok": false, "error": { "code", "message", "details?" } }` on failure. Amounts are decimal strings in human units (e.g. `"125.50"`). Write requests must send `Content-Type: application/json`. contact: name: Aro Media url: https://aro.media servers: - url: https://aropay.aro.media/api/v1 description: Sandbox - url: http://aropay.localhost:3000/api/v1 description: Local development security: - apiKeyAuth: [] - sessionCookie: [] tags: - name: Auth description: Password, TOTP, and passkey login; session inspection and logout. - name: Profile & security description: Profile, password, two-factor authentication, and passkey management. x-group: Profile & security - name: API keys description: Programmatic credentials. Creation and revocation are session-only. - name: Wallets description: Custodial and external (watch-only) wallets. - name: Balances description: Balance triples and lightweight gas reads. - name: Money movement description: Faucet funding, minting, transfers, and redemptions. - name: Transactions description: History, single-transaction reads, and notarized receipts. - name: Sandbox description: Unauthenticated status and echo probes with a flat response shape. paths: /wallets/{id}/export: post: tags: - Wallets summary: Export wallet key description: | **Session-only.** Export a custodial wallet's private key as a passphrase-encrypted `.nota` envelope (PBKDF2-SHA256 with 310,000 iterations + AES-256-GCM, applied server-side; the plaintext key never leaves the platform). Only custodial wallets can be exported. operationId: exportWallet parameters: - $ref: '#/components/parameters/WalletId' requestBody: required: true content: application/json: schema: type: object required: - passphrase properties: passphrase: type: string minLength: 8 maxLength: 200 description: >- Encrypts the exported key. Choose a long one; it cannot be recovered. responses: '200': description: Encrypted key envelope. content: application/json: schema: $ref: '#/components/schemas/NotaEnvelope' example: ok: true data: filename: payouts-key.nota nota: …passphrase-encrypted key envelope… '400': description: Non-custodial wallet or validation failure. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/SessionRequired' '404': $ref: '#/components/responses/NotFound' '429': $ref: '#/components/responses/RateLimited' '500': $ref: '#/components/responses/InternalError' security: - sessionCookie: [] components: parameters: WalletId: name: id in: path required: true schema: type: string description: Wallet ID. schemas: NotaEnvelope: type: object required: - ok - data properties: ok: const: true data: type: object required: - filename - nota properties: filename: type: string description: Suggested filename for the `.nota` file. nota: type: string description: Serialized Notareum resource. Treat as an opaque blob. ErrorResponse: type: object description: The shared failure envelope. required: - ok - error properties: ok: const: false error: type: object required: - code - message properties: code: type: string description: Machine-readable error code; match on this, not `message`. message: type: string details: description: Structured context, e.g. per-field validation issues. responses: Unauthorized: description: Missing or invalid credential. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: ok: false error: code: invalid_api_key message: Invalid API key. SessionRequired: description: Session-only endpoint called with an API key. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: ok: false error: code: session_required message: This action requires a browser session. NotFound: description: Resource not found within this account. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: ok: false error: code: not_found message: Resource not found. RateLimited: description: Rate limit exceeded. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: ok: false error: code: rate_limited message: Too many requests. Try again shortly. InternalError: description: Unexpected server error. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: ok: false error: code: internal_error message: An unexpected error occurred. securitySchemes: apiKeyAuth: type: http scheme: bearer bearerFormat: aro_sk_… description: | AroPay API key, sent as `Authorization: Bearer aro_sk_…`. Created in the dashboard under Settings → API keys. Takes precedence over a session cookie when both are present. x-default: aro_sk_your_key_here sessionCookie: type: apiKey in: cookie name: aropay_session description: | Browser session cookie minted by `POST /auth/login` (or passkey login). httpOnly, `SameSite=Lax`, 24 h TTL. Endpoints marked **Session-only** accept only this credential and return `403 session_required` for API keys. ````