[Narek13]

Tracking added through WooCommerce Shipment Tracking never reached PayPal. The PayPal Package Tracking box stayed empty and nothing appeared in the logs.

Why

Both plugins answer wp_ajax_wc_shipment_tracking_save_form at the default priority. WooCommerce Shipment Tracking registers first and ends its handler with die(), so ours never ran:

prio 10   WC_Shipment_Tracking_Actions::save_meta_box_ajax    <- runs first, die()
prio 10   Closure  ShipmentTrackingIntegration.php:75         <- never reached

The only logging sits inside that callback, which is why the report stood since April with nothing to go on.

The fix

Priority 5, ahead of that handler. The callback reads the tracking from the request, not from what the other plugin stores, so running first costs it nothing.

Hooking wc_shipment_tracking_before_add_tracking_items would be tidier but it is absent from older versions, and the compat gate checks no version at all.

Verified

On the admin order screen with WooCommerce Shipment Tracking 2.3.1:

• reverted — add tracking, PayPal box stays empty, log silent
• applied — add tracking, the shipment appears

ShipStation, which the ticket also names, was tested separately and works: firing woocommerce_shipstation_shipnotify synced the tracking to PayPal and it reads back. Its integration hooks ShipStation's own action, so this trap never applied. That half of the report does not reproduce.

Test steps

1. Activate WooCommerce Shipment Tracking, enable PayPal logging.
2. Open a PayPal-paid order whose capture still resolves, so the PayPal box renders.
3. Add tracking in WooCommerce's Shipment Tracking box.
4. Expected: the shipment appears in PayPal Package Tracking Status. If PayPal rejects it, the log now says Couldn't sync tracking information: … — either way the callback ran.
5. Tracking added over REST is unchanged.

[github-actions]

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What's included:

• ✅ WordPress (latest)
• ✅ WooCommerce (latest)
• ✅ PayPal Payments plugin v4.1.3-pr4747-36132993729-gfebe8ac (built from this PR)

Login credentials:

• Username: admin
• Password: password

Plugin Details:

• Version: 4.1.3-pr4747-36132993729-gfebe8ac
• Commit: f03300c
• Artifact: woocommerce-paypal-payments-4.1.3-pr4747-36132993729-gfebe8ac

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