I have seen several affilaite programs use this blank image approah to pass the value to another server to work in the background.
such as
- Visitor completes purchase and is shown the "thank you for purchasing" page
Embedded link on page informs Interneka Affiliate of the completion of transaction
(img src="https://interneka.com/affiliate/WIDLink.php?WID=######& TotalCost=###.##&OrderID=XXXXXX" width=1 height=1)
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how this blank image link idea works? and this approach can be used in what places else? is there some articles talking about how to use this blank image link approach?