Gravity Forms - API Email Validation for FIELD

gistfile1.txt

// Email validation by third-party API

// The following example shows how you can send the value of an Email type field to a third-party API to determine if the email is valid. In this example we are using the QuickEmailVerification API.

add_filter( 'gform_field_validation', function ( $result, $value, $form, $field ) {
    if ( $field->get_input_type() === 'email' && $result['is_valid'] ) {
        $request_url = add_query_arg(
            array(
                'email'  => $value,
                'apikey' => 'your_api_key_here',
            ),
            'http://api.quickemailverification.com/v1/verify'
        );

        $response       = wp_remote_get( $request_url );
        $response_json  = wp_remote_retrieve_body( $response );
        $response_array = json_decode( $response_json, 1 );

        if ( rgar( $response_array, 'result' ) !== 'valid' ) {
            $result['is_valid'] = false;
            $result['message']  = 'Email is invalid';
        }
    }

    return $result;
}, 10, 4 );