The process flow for Aliexpress is straight forward.
Customer buys from your website
Payment gateway processes payment
Orderlytics gets confirmation of successful payment
Orderlytics initiates matching CF product ID to Aliexpress SKU order
Order processed inside Aliexpress based on shipping method selected
Aliexpress supplier processes order
Aliexpress supplier ships order
Orderlytics obtains tracking details and updates order inside Orderlytics
Package received by customer
Orderlytics processes all upsell/downsell items as well as bumps in your funnel flow. You can even hold the main product sale in Orderlytics to wait for all OTOs before processing as a single cart item.