What does trade reference mean?

[phiphili]

Dear Sir

Please explain what does the trade reference mean? And normally in which situation we will use it?

Thanks for your help

[lost_soul]

Hi,

a reference in which one trader gives his opinion as to the creditworthiness of another trader in the same trade, esp to a supplier

From Collins dictionary
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Alex

How much upchuck would a woodchuck upchuck if a woodchuck could upchuck ?

(a guy from Russia)