Microsoft Graph Contracts

Microsoft Graph Contracts is a read-only API in Microsoft Graph that lets Microsoft 365 partners (such as CSP/resellers) discover and list the customer tenants they have a relationship with. It returns each customers key directory identifiers and metadatalike tenant (customer) ID, default domain name, display name, and the relationship/contract typeso partner apps can enumerate customers, scope operations per tenant, and obtain tokens targeted at the right directory. The relationship itself is established and managed in Partner Center (not via the API). For newer, granular delegated admin scenarios, partners typically also use the tenantRelationships/delegatedAdminRelationships APIs alongside Contracts.