Error when Order Approval plugin is enabled

I’m currently experiencing an error on my website when I’m on the payment page. I tried selecting GCASH or other payment methods and the error below will appear. An error will only appear when my plugin “SG Order Approval” or “Woocommerce Order Approval” is activated. I hope someone would be able to help me. Thank you!

Error: Client error: POST?<a rel="noreferrer noopener" href="https://api.paymongo.com/payment_intents//attach" target="_blank">https://api.paymongo.com/payment_intents//attach?resulted in a 404 Not Found response: {“status”:404,”error”:”Not Found”}