# EndpointAuthentication Structured credential payload describing how GoodMem should authenticate with an upstream provider. `Goodmem.Client.Models.EndpointAuthentication` - `ApiKey` (`ApiKeyAuth?`): Configuration when kind is CREDENTIAL_KIND_API_KEY JSON: `apiKey`. - `GcpAdc` (`GcpAdcAuth?`): Configuration when kind is CREDENTIAL_KIND_GCP_ADC JSON: `gcpAdc`. - `Kind` (`CredentialKind`, required): Selected credential strategy JSON: `kind`. - `Labels` (`IReadOnlyDictionary?`): Optional annotations to aid operators (e.g., "owner=vertex") JSON: `labels`. [.NET](../../dotnet.md) Related types — open only those used by your request: - [ApiKeyAuth](ApiKeyAuth.md) - [CredentialKind](CredentialKind.md) - [GcpAdcAuth](GcpAdcAuth.md)