Woocommerce/2Checkout plugin redirect to Error 404 after successful payment

Please i have this issue on my webstore made with Woocommerce/Wordpress and the payement gateway is 2Checkout inline, After a successful payement i’m getting a 404 error instead of thankyou page (like in your video) :

1 – With 2Checkout gateway the link is this (404 Error) :

https://www.example.com/?wc-api=payment_response&pm=twocheckout_inline&order-ext-ref=6827&refno=353985938&total=1&total-currency=EUR&signature=00000

—-

2 – With another method of payement (cash on delivery for example) :

https://www.example.com/commande/order-received/6823/?key=wc_order_pOVp15xoFFEM5

Please if any can make any suggestions to how to solve this issue. Thank you very much