Merchant's trial period expired

hi when I want to place an order for test,it told me that Merchant’s trial period expired,can someone help me ?

other discussion link:

https://community.shopify.com/c/shopify-apis-and-sdks/unable-to-test-dev-checkout-checkout-system-disabled-merchant-s/m-p/414901

my shop is:https://xn-czrs0tukmh4vv9iut1a.myshopify.com