Starbucks will require people visiting its coffee shops to buy something in order to stay or to use its bathrooms, the company announced in a letter sent to store managers on Monday.

The new policy, outlined in a Code of Conduct, will be enacted later this month and applies to the company’s cafes, patios and bathrooms.

“Implementing a Coffeehouse Code of Conduct is something most retailers already have and is a practical step that helps us prioritize our paying customers who want to sit and enjoy our cafes or need to use the restroom during their visit,” Jaci Anderson, a Starbucks spokeswoman, said in an emailed statement.

Ms. Anderson said that by outlining expectations for customers the company “can create a better environment for everyone.”

Starting on Jan. 27, Starbucks stores will operate under a Code of Conduct that prohibits behavior including harassment, smoking and panhandling.Credit…Dylan Cole for The New York Times

The Code of Conduct will be displayed in every store and prohibit behaviors including discrimination, harassment, smoking and panhandling.

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