There is several reason why your payment page is not showing:
- There is no payment method in your store.
- You have activated bypass payment page settings
- One of your product setting's is "Display as estimated price"
- Your customer place an order with Total order amount = $0
If you wish to show your payment page, the solutions will be
- Add at least 1 payment method - (Adding payment method)
- De-activate bypass payment page settings (from Settings > Checkout)
- Find all products that have "Display as estimated price" and de-activate this setting.
- Have any order total amount bigger than $0
