Monthly Invoice Gateway for WooCommerce

Monthly Invoice Gateway for WooCommerce adds a deferred payment method to your WooCommerce store. Customers can place orders without immediate payment and receive a consolidated invoice at the end of the billing period.

This plugin is designed for B2B (business-to-business) transactions where monthly invoicing is the standard payment practice.

Note: The plugin includes payment management (e.g. tracking paid/unpaid status). The free version does not include invoice generation or automated invoice notifications — sellers must create and send invoices to customers manually.

Key Features

• Monthly invoice (deferred payment) gateway
• Compatible with both WooCommerce Checkout Block and legacy checkout
• Flexible billing closing day (1st–30th or end of month)
• Optional payment fee (taxable or non-taxable)
• Per-user access control (individual approval system)
• Customizable thank you page message with template variables
• Usage details page with monthly billing breakdown
• Monthly history page with aggregated data
• Customer management page with search and filters
• Payment status tracking (paid/unpaid)
• WooCommerce HPOS (High-Performance Order Storage) compatible
• WooCommerce Cart & Checkout Blocks compatible
• Internationalization (i18n) ready — translations included for Japanese, German, Spanish, French, Italian, and Portuguese (Brazil)

How It Works

1. Enable the payment method in WooCommerce > Settings > Payments
2. Customers select “Monthly Invoice” at checkout
3. Orders are consolidated by the billing closing day
4. Admins manage invoices and payment status from the admin panel

User Access Control

• Automatic (default): All users with the customer role can use invoice payment
• Manual approval: Enable per-user restrictions and individually approve customers on the customer management page

Note: Admin-level roles (administrator, editor, author, contributor, shop_manager) cannot use this payment method.

Thank You Page Variables

Customize the thank you page message with these variables:

• {order_id} — Order ID
• {order_number} — Order number
• {customer_name} — Customer name
• {company_name} — Company name
• {order_total} — Order total
• {order_date} — Order date
• {closing_day} — Billing closing day

Database

When activated, the plugin creates one table (the prefix may differ from wp_ depending on your WordPress configuration):

• wp_cdg_mig_monthly_invoice_payments — Stores invoice payment records per order: order ID, user ID, amount, billing month, payment status (paid/unpaid), and related dates. Used for the usage details and monthly history pages.

1. Upload the plugin folder to /wp-content/plugins/
2. Activate the plugin through the “Plugins” menu in WordPress
3. Go to WooCommerce > Settings > Payments > “Monthly Invoice (Deferred Payment)” to configure

Does the free version include invoice issuance or notifications?

The plugin includes payment management (tracking paid/unpaid status), but the free version does not include invoice generation or automated invoice notifications. Sellers must create and send invoices to customers manually. Invoice issuance and notification features may be available in a premium version.

The payment method does not appear at checkout

Please check the following:

• The payment method is enabled in WooCommerce > Settings > Payments
• You are logged in as a customer user (with the customer role)
• If “Restrict Usage by User” is enabled, the customer must be individually approved on the customer management page

Some users do not appear on the customer management page

Only users with the customer role are displayed. Users with other roles are not shown.

Payment status column is not visible

Make sure “Payment Status Tracking” is enabled in the plugin settings.

What happens to my data when I delete the plugin?

When you delete (not just deactivate) the plugin from the WordPress admin panel, all plugin data is automatically removed:

• Database tables (wp_cdg_mig_monthly_invoice_payments)
• User meta (cdg_mig_monthly_invoice_allowed)
• Plugin options (woocommerce_monthly_invoice_gateway_settings)

Deactivating the plugin does NOT delete any data.

1.0.1

• Translation updates: synced all .po files with the .pot template and corrected fuzzy entries for German (de_DE), Spanish (es_ES), French (fr_FR), Italian (it_IT), and Portuguese Brazil (pt_BR). Japanese (ja) unchanged.

1.0.0

• Initial release.
• Monthly invoice (deferred payment) gateway for WooCommerce.
• Compatible with WooCommerce Checkout Block and legacy checkout.
• Billing closing day, payment fee, per-user access control, thank you page message.
• Usage details, monthly history, and customer management pages.
• Payment status tracking (paid/unpaid).
• Translations: Japanese, German, Spanish, French, Italian, Portuguese (Brazil).