&lt;p&gt;When customers checkout to complete their purchase, Stockbox can pass the registration information to the Payment Gateway payment form.&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;Note:&lt;/strong&gt; It is only necessary to make changes to this section if you remove any of the default Registration form fields and replace them with your own custom fields.&lt;/p&gt;
&lt;p&gt;Map all fields of the billing info to the Registration form field in the drop down list.&lt;/p&gt;
&lt;p&gt;The drop down list contains the fields that are present in the customer Registration form.&lt;/p&gt;
&lt;p&gt;Click the &lt;strong&gt;Submit&lt;/strong&gt; button&lt;/p&gt;
&lt;p&gt;The details that customers enter into the mapped fields will be used to fill out the billing form.&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;