# EndpointAuthentication Structured credential payload describing how GoodMem should authenticate with an upstream provider. ```ts export type EndpointAuthentication = Prettify & { kind: "CREDENTIAL_KIND_API_KEY"; apiKey: ApiKeyAuth; gcpAdc?: null | undefined; }> | Prettify & { kind: "CREDENTIAL_KIND_GCP_ADC"; apiKey?: null | undefined; gcpAdc: GcpAdcAuth; }> | Prettify & { kind: "CREDENTIAL_KIND_UNSPECIFIED"; apiKey?: null | undefined; gcpAdc?: null | undefined; }>; ``` Helper definitions for the constraints above (kept here to avoid extra page reads): ```ts export type Prettify = { [K in keyof T]: T[K]; } & {}; ``` [TypeScript](../../typescript.md) Related types — open only those used by your request: - [ApiKeyAuth](ApiKeyAuth.md) - [EndpointAuthenticationBase](EndpointAuthenticationBase.md) - [GcpAdcAuth](GcpAdcAuth.md)