It would depend on the reason for failing.
Are the correct items per vendor set up correctly ?
Did you investigate and see which ones it didn't purchase ?
Did you check to see if there was a miss spell somewhere that meant it couldn't find the item to purchase ?
Did you run out of currency to purchase the item ?
Finding out why it happened will put you in the direction of identifying what needs to be done. It could be as simple as removing a non existent item, correct a spelling mistake or coding a stop or skip when the required currency is no longer availablw.
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