> ## Documentation Index > Fetch the complete documentation index at: https://docs.engini.ai/llms.txt > Use this file to discover all available pages before exploring further. # Get OAuth access token > Second half of the OAuth pairing with POST /connections/get-sign-in-url. Retrieves the token data captured once the end user completes the sign-in flow for the given state. Returns a null body if the flow hasn't completed yet - poll until a non-null response is returned, then use tokenData/connectionData to complete the connection. ## OpenAPI ````yaml /developers/api-reference/openapi.json get /v1/connections/access-token/{state} openapi: 3.0.0 info: title: Engini API version: v1 description: The Engini public API. servers: - url: https://api.engini.io security: - Bearer: [] - ApiKey: [] tags: - name: Auth description: Identify the caller a Developer API request is authenticated as. - name: On-prem agents description: >- Provision and manage agents that run Engini tasks inside a customer's network. - name: Applications description: >- Discover the applications (toolkits) available in Engini and their connection requirements. - name: Tools description: Browse and execute the tools exposed by Engini applications. - name: Toolsets description: Manage toolsets - named groupings of connections and tools. - name: McpServers description: >- Inspect and maintain MCP servers - the account-wide endpoints that expose Engini tools and workflows over the Model Context Protocol. Distinct from the MCPClient connection kind, which is Engini consuming a third-party MCP server. - name: Connections description: >- Manage connections to applications, including OAuth sign-in and default-connection selection. - name: Triggers description: >- Create triggers that fire when something changes in a connected app, and manage the destinations their events are delivered to. paths: /v1/connections/access-token/{state}: get: tags: - Connections summary: Get OAuth access token description: >- Second half of the OAuth pairing with POST /connections/get-sign-in-url. Retrieves the token data captured once the end user completes the sign-in flow for the given state. Returns a null body if the flow hasn't completed yet - poll until a non-null response is returned, then use tokenData/connectionData to complete the connection. operationId: Connections_GetAccessToken parameters: - name: state in: path required: true description: The state value returned when the sign-in URL was generated. schema: type: string x-position: 1 responses: '200': description: >- The access token data for the state, or null if no token has been captured yet. content: application/json: schema: $ref: '#/components/schemas/AccessTokenResponse' example: status: completed error_message: null fieldOptions: ApiVersionUrl: /services/data/v60.0: '60.0' /services/data/v59.0: '59.0' '400': description: Bad request - malformed body or invalid parameters. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Unauthorized - missing or invalid bearer token or API key. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '403': description: Forbidden - the caller lacks access to the resource. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '404': description: Not found - the resource does not exist. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '429': description: Too many requests - rate limit exceeded. headers: Retry-After: description: Number of seconds to wait before retrying. schema: type: integer content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '500': description: Internal server error - an unexpected error occurred. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' security: - Bearer: [] - ApiKey: [] x-codeSamples: - lang: python label: Python source: |- from engini import Engini client = Engini() # reads ENGINI_API_KEY # state is the value returned with the sign-in URL token = client.connections.get_access_token(state) - lang: typescript label: TypeScript source: |- import { Engini } from "@engini/sdk"; const client = new Engini(); // reads ENGINI_API_KEY // state is the value returned with the sign-in URL const token = await client.connections.getAccessToken(state); - lang: bash label: CLI source: |- # polls the access-token endpoint, then creates the connection engini connections oauth-complete outlook --auth 0 --state components: schemas: AccessTokenResponse: type: object additionalProperties: false required: - status - tokenData - connectionData - fieldOptions properties: status: type: string error_message: type: string nullable: true tokenData: type: object additionalProperties: {} connectionData: type: object additionalProperties: {} fieldOptions: type: object description: >- Per-field option lists a connector can supply after sign-in, keyed by AppConnectionField.FieldName. Empty for connectors that supply none. additionalProperties: type: object additionalProperties: type: string ErrorResponse: type: object description: >- Unified machine-readable error envelope returned by every non-200 Developer API response. additionalProperties: false required: - errorCode - message - requestId - timestamp properties: errorCode: type: string description: Machine-readable error code identifying the failure. message: type: string description: Human-readable error message. requestId: type: string description: Identifier of the request, for support/correlation. timestamp: type: string description: Timestamp when the error occurred (ISO 8601). details: type: array description: Per-field validation details, when applicable. nullable: true items: $ref: '#/components/schemas/ErrorDetail' ErrorDetail: type: object description: A single field-level error detail within an ErrorResponse. additionalProperties: false required: - field - issue properties: field: type: string description: Name of the field the issue relates to. issue: type: string description: Description of the issue with the field. securitySchemes: Bearer: type: http description: Enter your JWT token scheme: bearer bearerFormat: JWT ApiKey: type: apiKey description: >- Opaque Developer API key (prefix `eng_`). Authenticates as the key's owner and resolves the account automatically. name: x-api-key in: header ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.