A few examples to better make sense of what I am asking are:
Please provide me with your merchant ID.
Can you please provide me with your Merchant code?
Enter Merchant ID
Merchant Account ID
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merchant could be replaced with
seller, as in "person who's selling something", the best translations would be
lojista. Keep in mind
vendedor is a gendered word that could pose an issue to your translation.
If it's supposed to mean
shop manager, as in "person who can make decisions about the shop", then
comerciante would be preferable.