Ecart API Tracking number call to email help !

hello,

I’m using a stupid fulfillment and shipping service, this company uses Ecart API to integrate its platform with WooCommerce and there is no plugin ( only webhook).

I’m trying to add the tracking number to the “complete order email” template but it’s not working I tried more than 10 ways [https://imgur.com/a/M0xP9Fb](https://imgur.com/a/M0xP9Fb)