Final answer:
In case of two failed attempts at scanning a rewards barcode, the rewards number should be manually entered. If scanning and manual entry both fail, the customer may need to contact customer service to resolve any issues with their rewards account.
Step-by-step explanation:
If there are two failed attempts at scanning the rewards barcode, the usual procedure is to manually enter the rewards number associated with the customer's account. This can be done by the cashier or the customer, depending on the store's policy. If both scanning and manual entry fail, the customer should check to see if there might be an issue with their rewards account that needs attention. Typically, stores have a customer service number or help desk where issues with rewards accounts can be addressed.
In the event of persistent problems, the customer might need to ensure that their account is active, update their account details, or potentially reissue a new barcode if there is a problem with the physical card or digital barcode.