Create a Stripe Customer with Gravity Forms Stripe Product Feed

functions.php

add_filter( 'gform_stripe_customer_id', function ( $customer_id, $feed, $entry, $form ) {
    if ( rgars( $feed, 'meta/transactionType' ) == 'product' && rgars( $feed, 'meta/feedName' ) == 'Create Customer and Payment' ) {
        $customer_meta = array();
 		
        $metadata_field = rgars( $feed, 'meta/metaData' );

        foreach ($metadata_field as $metadata) {
            if ($metadata['custom_key'] == 'Email') {
                $email_field = $metadata['value'];
            }
        }
        
        if ( ! empty( $email_field ) ) {
            $customer_meta['email'] = gf_stripe()->get_field_value( $form, $entry, $email_field );
        }
		
        $customer = gf_stripe()->create_customer( $customer_meta, $feed, $entry, $form );
 
        return $customer->id;
    }
 
    return $customer_id;
}, 10, 4 );