...
https://brand.mymalomo.com/xxxxx/?_m_alt_id={{ event.extra.order.meta.shopify_order.id }}
We recommend using the Malomo Order ID variable but there are some use cases for the Shopify Order ID. One example: if you are using a Rebuy product recommendation widget on the tracking page, we recommend using the Shopify Order ID variable, as that will pass order information to the Rebuy widget.