A credit by its nature is a separate transaction from the sale or other contract on which it may be based. Banks are in no way concerned with or bound by such contract, even if any reference whatsoever to it is included in the credit
If bank is presented with documents, bank is absolutely bound to make payment irrespective of whether it knew or had reason to believe, that the goods were not conforming
Non-documentary conditions in a L/C get ignored
If goods don’t actually conform, buyer can sue seller for damages