Developer Reference

Constants

Constant	Description
`SHIPLABEL_VERSION`	Plugin version
`SHIPLABEL_FILE`	Absolute path to the main plugin file
`SHIPLABEL_PATH`	Plugin directory path
`SHIPLABEL_URL`	Plugin URL
`SHIPLABEL_LICENSE_OPTION`	Option name storing the license key
`SHIPLABEL_LICENSE_STATUS_OPTION`	Option name storing the license status

Class	File
`ShipLabel_Admin`	`includes/admin/class-shiplabel-admin.php`
`ShipLabel_Admin_Bulk_Actions`	`includes/admin/class-shiplabel-admin-bulk-actions.php`
`ShipLabel_Admin_Order_List_Column`	`includes/admin/class-shiplabel-admin-order-list-column.php`
`ShipLabel_Admin_Order_Metabox`	`includes/admin/class-shiplabel-admin-order-metabox.php`
`ShipLabel_REST_Controller`	`includes/api/class-shiplabel-rest-controller.php`
`ShipLabel_Carrier_Base`	`includes/carriers/class-shiplabel-carrier-base.php`
`ShipLabel_USPS_API`	`includes/carriers/class-shiplabel-usps-api.php`
`ShipLabel_FedEx_API`	`includes/carriers/class-shiplabel-fedex-api.php`
`ShipLabel_USPS_Shipping_Provider`	`includes/carriers/class-shiplabel-usps-shipping-provider.php`
`ShipLabel_FedEx_Shipping_Provider`	`includes/carriers/class-shiplabel-fedex-shipping-provider.php`
`ShipLabel_Settings`	`includes/class-shiplabel-settings.php`
`ShipLabel_Install`	`includes/class-shiplabel-install.php`
`ShipLabel_Tracking_Webhook`	`includes/class-shiplabel-tracking-webhook.php`
`ShipLabel_Fulfillment_Manager`	`includes/fulfillment/class-shiplabel-fulfillment-manager.php`
`ShipLabel_Label_Store`	`includes/fulfillment/class-shiplabel-label-store.php`

shiplabel/v1 - see REST API for the full endpoint list.

Hook	Schedule	Description
`shiplabel_sync_tracking_statuses`	Twice daily	Polls carriers for tracking updates on active labels

Action	Description
`shiplabel_save_settings`	Unified settings save (all tabs)
`shiplabel_reset_settings`	Reset settings, preserving credentials and shipper address
`shiplabel_test_connection`	Test USPS/FedEx OAuth credentials
`shiplabel_validate_address`	Validate an address against USPS or FedEx
`shiplabel_license_action`	Activate/deactivate the license key

Filter	Arguments	Description
`shiplabel_fulfillment_class`	`$class (string)`	Override the WooCommerce Fulfillment class ShipLabel instantiates in Order Fulfillments Mode

Stored in the shiplabel_settings option (ShipLabel_Settings::defaults()):

Key	Default	Description
`usps_enabled` / `fedex_enabled`	`no`	Carrier master toggles
`usps_env` / `fedex_env`	`production`	`production` or `sandbox`
`usps_default_service`	`PRIORITY_MAIL`	-
`fedex_default_service`	`FEDEX_GROUND`	-
`usps_label_format` / `fedex_label_format`	`PDF`	-
`shipper_country`	`US`	-
`default_carrier`	`usps`	`usps` or `fedex`
`default_weight_unit`	`oz`	-
`default_dim_unit`	`in`	-
`default_package_type`	`package`	-
`auto_generate_label`	`no`	-
`auto_fulfill_on_label`	`no`	-
`label_file_retention`	`90`	Days
`debug_mode`	`no`	-

The webhook secret (shiplabel_webhook_secret) and license key/status are stored as separate options, not inside shiplabel_settings.