public CreateBackendAuthUserPoolConfig withSignInMethod(SignInMethod signInMethod) {
        this.signInMethod = signInMethod.toString();
        return this;
    }
<p>
Describes the sign-in methods that your Amplify app users use to log in using the Amazon Cognito user pool,
configured as a part of your Amplify project.
</p>

@param signInMethod
       Describes the sign-in methods that your Amplify app users use to log in using the Amazon Cognito user
       pool, configured as a part of your Amplify project.
@return Returns a reference to this object so that method calls can be chained together.
@see SignInMethod
aws-java-sdk-amplifybackend/src/main/java/com/amazonaws/services/amplifybackend/model/CreateBackendAuthUserPoolConfig.java