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.”

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