credentials

type Credential struct {
	Headers   map[string]string
	Query     map[string]string
	ExpiresAt time.Time
	Sign      func(*http.Request) error
}

type Provider interface {
	Resolve(ctx context.Context, in Request) (Credential, error)
}

type Request struct {
	OperationID string
	Method      string
	URL         string
	Scheme      string
	UserToken   string
	Scopes      []string
	Audience    string
}