Interface that represents the credentials returned by an auth provider. Implementations specify the details about each auth provider's credential requirements.
The authentication provider ID for the credential. For example, 'facebook.com', or 'google.com'.
The authentication sign in method for the credential. For example, 'password', or 'emailLink. This corresponds to the sign-in method identifier as returned in firebase.auth.Auth.fetchSignInMethodsForEmail.
Returns a JSON-serializable representation of this object.
Static method to deserialize a JSON representation of an object into an firebase.auth.AuthCredential. Input can be either Object or the stringified representation of the object. When string is provided, JSON.parse would be called first. If the JSON input does not represent an
AuthCredential, null is returned.
json: Object | string