Amazon.com (AMZN) - Get Report has delayed the opening of its first cashier-less grocery store in order to workout technical kinks relating to how customers are charged.

The store, Amazon Go, was due to open to the public by the end of the month after it was opened back in December to employees for a beta test, sources told the Wall Street Journal.

It is unclear when the store will open to the public now. It was meant to open in Seattle, and uses cameras, sensors and algorithms to track customers and monitor what they pick up. However, Amazon has been having trouble tracking more than 20 people at a time.

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