Shoppers flocked to Thailand's top-end malls on Sunday, eager for retail therapy as shopping centres reopened in a gradual easing of restrictions to revive the virus-ravaged economy.

The shopping centre relaunch comes with Thailand's infection numbers slowing in recent weeks -- authorities announced three new cases Sunday, with the total at just over 3,000.

Customers and businesses were advised to adhere to restrictions, which include limits on the number of people allowed in retail spaces and a ban on alcohol sales in restaurants.

The government is also urging retailers and shoppers to check in on a digital platform when entering malls -- it will send a message if a coronavirus case is discovered in a specific store.

Shopping centres -- along with other public spaces like stadiums, gyms and parks -- were ordered to close in mid-March as Thailand entered a state of emergency to curb the spread of infections.