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The total price presented is just the cost of one item and its associated shipping. If the quantity is changed, nothing happens to the total.
Expectation: when I change the quantity, the price updates to reflect that.
I've implemented this here.
I wrote an implementation that does this, but grabs the currency from AliExpress itself:
https://gist.github.com/Biotronic/7afca676b5f6c48ca1f26cb797fcda60
Feel free to use the above code, though there may be some rough edges.