 location. Post Meta: _client_address City Text City name, populated from country selection. Post Meta: _client_city State/Province Select Dropdown State or province, dynamically populated based on selected country. Post Meta: _client_state Zip/Postal Code Text Postal or zip code for the client's location. Post Meta: _client_zip Country Select Dropdown Client's country. When changed, updates the State/Province options. Post Meta: _client_country Tax ID Text Client's tax ID, VAT number, or similar tax identifier. Used on invoices. Post Meta: _client_tax_id