Update woocommerce thankyou page based on API request result

I create a custom woocommerce payment gateway plugin. First, I call an API, I take the formUrl from the response result then I redirect users to this payment form. At this step everything is Ok.

After the user enter his credit cards info and click validate the system redirect him to the default "order-received" page.

Before loading this page, I want to call another API to check the payment status, if the response body has the orderStatus== 1: I want to show the description in the response body (description = "Request processed successfully"), I reduce order stock, I update the status of order then I display the Order details. If the orderStatus == 2: I want to change the order status to ‘failed’ manually to show the default woocommerce-thankyou-order-failed message (”Unfortunately your order cannot be processed…") in the file thankyou.php or I just show a simple error payment message in this case.

In the payment class constractor I tried adding: add_action( ‘woocommerce_thankyou’, ‘thank_you_page’, 20, 1 ); but I dont know how to add my custom function or how to adapt this requirement.

My plugin looks like this one : https://github.com/YTTechiePress/custom-woocommerce-payment-gateway/blob/master/lesson-1/noob-payment-for-woocommerce.php