American Express Global Business Travel
American Express Global Business Travel (Amex GBT, NYSE GBTG, headquartered in New York) is the largest business-to-business travel platform in the world, operating in more than 140 countries under the Amex GBT, Egencia and Ovation brands, with CWT acquired in September 2025. Its home market is the United States. In the travel distribution chain Amex GBT is an intermediary rather than a supplier - a travel management company that aggregates air, hotel, rail, car and ground content sourced through the GDS layer, through NDC and through direct supplier connections, then resells it to corporate travel programmes with policy, approval, duty-of-care and reporting wrapped around it. It holds no inventory of its own, but it does hold the booking record, and that is where the switching cost lives. Its API posture is genuinely open at the documentation layer and firmly closed at the runtime layer. The Egencia Developer Center publishes thirteen named APIs and SPIs, and every one of them serves a real, anonymously retrievable OpenAPI 3.1.0 document from apis.egencia.com - no login, no key, no click-through. The identity surface is standards-based (SCIM 2.0 user provisioning over OAuth 2.0 client credentials); the booking, approval, expense, receipt, duty-of-care and reporting surfaces are proprietary Egencia shapes with no OpenTravel, HTNG or IATA NDC schema anywhere in them. Runtime access is customer-account gated - Egencia's own documentation states that "the values for client id and client secret will be provided to the Client after on-boarding to Egencia API platform", and every production endpoint returns 401 to an anonymous caller. So - public contracts, gated runtime, a real documented bulk data export in the BI Transactions API, and API terms Egencia reserves the right to change in its sole discretion.
American Express Global Business Travel publishes 26 APIs on the APIs.io network, including Agent Assist Notes API, Approval API, Availability Probes Controller API, and 23 more. Tagged areas include Travel, United States, Corporate Travel, Travel Management, and Business Travel.
The American Express Global Business Travel catalog on APIs.io includes 1 event-driven AsyncAPI specification.
American Express Global Business Travel’s developer surface includes authentication, changelog, sandbox, documentation, API reference, getting-started guide, support, and 50 more developer resources.
Kin Score
APIs 26
Individual APIs this provider publishes, each with its own machine-readable definition.
American Express Global Business Travel Agent Assist Notes API
The Agent Assist Notes API from American Express Global Business Travel — 1 operation(s) for agent assist notes.
American Express Global Business Travel Approval API
Approval interface that will get approval custom detail from external client based on the booking data passed in request
American Express Global Business Travel Availability Probes Controller API
The availability-probes-controller API from American Express Global Business Travel — 2 operation(s) for availability-probes-controller.
American Express Global Business Travel bookings v1 API
The bookings v1 API from American Express Global Business Travel — 12 operation(s) for bookings v1.
American Express Global Business Travel bookings v2 API
The bookings v2 API from American Express Global Business Travel — 2 operation(s) for bookings v2.
American Express Global Business Travel Company Details API
The Company Details API from American Express Global Business Travel — 2 operation(s) for company details.
American Express Global Business Travel Custom Data Field Cleanup Controller API
The custom-data-field-cleanup-controller API from American Express Global Business Travel — 1 operation(s) for custom-data-field-cleanup-controller.
American Express Global Business Travel Custom Data Fields (CDF) API
CDF APIs to retrieve Definitions and Manage Values.
American Express Global Business Travel Doc Audit Clean Up Controller API
The doc-audit-clean-up-controller API from American Express Global Business Travel — 1 operation(s) for doc-audit-clean-up-controller.
American Express Global Business Travel DutyOfCare Data API
The DutyOfCare Data API from American Express Global Business Travel — 2 operation(s) for dutyofcare data.
American Express Global Business Travel Ecommerce Settings Controller API
The ecommerce-settings-controller API from American Express Global Business Travel — 2 operation(s) for ecommerce-settings-controller.
American Express Global Business Travel Expense SPI API
Push Expense and Subscription Operation. This is only an example. The path and the host are specific for each implementor. However, the model is fixed and versioned.
American Express Global Business Travel Gdpr Controller API
The gdpr-controller API from American Express Global Business Travel — 1 operation(s) for gdpr-controller.
American Express Global Business Travel Pos Iata Controller API
The pos-iata-controller API from American Express Global Business Travel — 1 operation(s) for pos-iata-controller.
American Express Global Business Travel Receipts API
The receipts API from American Express Global Business Travel — 1 operation(s) for receipts.
American Express Global Business Travel Redirection Controller API
The redirection-controller API from American Express Global Business Travel — 2 operation(s) for redirection-controller.
American Express Global Business Travel Resolve Controller API
The resolve-controller API from American Express Global Business Travel — 1 operation(s) for resolve-controller.
American Express Global Business Travel Schemas Controller API
The schemas-controller API from American Express Global Business Travel — 2 operation(s) for schemas-controller.
American Express Global Business Travel SCIM User Sync V1 API
SCIM 2.0 compliant user sync APIs
American Express Global Business Travel SCIM User Sync V2 API
SCIM 2.0 compliant user sync APIs version 2.
American Express Global Business Travel SCIM User Sync V3 API
SCIM 2.0 compliant user sync APIs version 3.
American Express Global Business Travel SCIM V1 Admin Users API
SCIM 2.0 compliant admin-users sync APIs
American Express Global Business Travel Third Party Acknowledgement API
The Third Party Acknowledgement API from American Express Global Business Travel — 1 operation(s) for third party acknowledgement.
American Express Global Business Travel Transaction Service Controller API
Transaction data operations
American Express Global Business Travel Validation API
Validation interface that will request authorization of booking based on the data provided at checkout time.This is only an example. The path and the host are specific for each ...
American Express Global Business Travel Version Controller API
The version-controller API from American Express Global Business Travel — 1 operation(s) for version-controller.
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Open Collections 17
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Openconnect Approval Service
OPEN COLLECTIONEgencia Approval Workflow API
OPEN COLLECTIONEgencia Get Booking API
OPEN COLLECTIONEgencia Cancellation/Deletion API
OPEN COLLECTIONEgencia Company CDF API
OPEN COLLECTIONCompany Details API
OPEN COLLECTIONDuty Of Care API
OPEN COLLECTIONExpense SPI
OPEN COLLECTIONEgencia Receipt API
OPEN COLLECTIONBI API
OPEN COLLECTIONBI API
OPEN COLLECTIONOpenAPI definition
OPEN COLLECTIONDuty Of Care API
OPEN COLLECTIONOpenAPI definition
OPEN COLLECTIONSSO Context API
OPEN COLLECTIONEgencia User Sync API
OPEN COLLECTIONValidation SPI
OPEN COLLECTIONScroll for all 17
MCP Servers 1
Model Context Protocol servers that expose these APIs to AI agents.
Event Specifications 1
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Amex Gbt Webhooks
ASYNCAPISecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Get Started 3
Portal, sign-up, and the first successful call
Documentation 6
Reference material describing how the API behaves
Agent Surfaces 5
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 7
Pagination, idempotency, versioning, errors, and events
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Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 6
Authentication, authorization, and security posture
Operate 4
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 4
The organization behind the API
Other 17
Properties that don't map to a standard resource type
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Source (apis.yml)
Work with this as data
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