It's very easy to buy Korea (south) virtual number here, no contract signing or verification process required. In fact, the process is automated.
When your Korea (south) virtual numbers receive sms you can simply read the sms online from the portal and/or forward the text to your web application via HTTP webhook using this documentation.
Buy virtual number for OTP verification in Korea (south), the number is exclusively yours, until you decide to let go and stop paying monthly subscription.
In addition to credit card payment option, you can also buy cheap Korea (south) virtual number with crypto and digital currency.
Receive and process SMS from your audience; as configured in your campaigns. You can specify if to remove or add the sender's number to particular contact groups.
Also, Your Korea (south) virtual number can be used to forward incoming sms to you web application through your webhook and you may as well access your texts via API with the HTTP request, all without a SIM.