The workers must first verify they are fully vaccinated, the company noted in an update posted online.

In order to verify their vaccination status, workers must upload their COVID-19 vaccine information on an internal employee portal. Along with providing proof of vaccinations, employees must also be 14 or more days past their final dose of vaccines for Pfizer or Moderna, or single dose for Johnson & Johnson.

Meanwhile, the online retail giant added 500,000 workers around the world last year—with more than 400,000 of them in the U.S. alone—as the demand for online delivery skyrocketed during the pandemic.

Update 05/19/21 3:20 p.m. EDT, with additional information.

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