Here's how the correct URL format:
http://affusername.sellerusername.zaxaa.com/o/sku/pricenumber

where:

affusername = affiliate username

sellerusername = seller username

sku = product sku (found inside your product settings >> general settings >> top left)

pricenumber = if you use multiple pricing feature, replace this value with the price number (1 - 5). if you only have a single price for your product, replace this value with "1"

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