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If you’d like to use WooCommerce as a payment method, enable WooCommerce under the payment tab in the BookIt Calendar Settings.
You will need to specify the WooCommerce product for it. You can create one WooCommerce product for all services and specified it in the BookIt Calendar settings. Just select it from the dropdown under the WooCommerce Product title.
The instructions above consider that the WooCommerce plugin is already set up on your site. If not, please follow the WooCommerce instructions here: https://docs.woocommerce.com/documentation/plugins/woocommerce/getting-started/