i need to build the woocommerce registraton form with custom fields with this plugin.
For starters, WC’s registration form and WP-Members form are separate. You can’t use WP-Members to add fields to WC’s form.
If you are using WP-Members to register users and then want that data to be saved so that WC recognizes it, you need to create fields with the correct meta keys. It doesn’t sound like you have that (for example, there is no “billing_address” field in WC; but there is billing_address_1 and billing_address_2).
Any field that is created in the WP-Members fields that you want to match up with a WC field needs to have the correct meta key. For the WP-Members fields, the meta key is the “option name”. There is a list of WC field meta keys in the WC codex here (scroll down to where is says “Here’s a full list of fields in the array passed to woocommerce_checkout_fields”).
