Some resources to confirm registration require entering the mobile phone number to which the verification code is sent. And this code, then, must be entered on the site. That is exactly for such cases and there are SMS services. ZennoPoster, in turn, tries to simplify the work with them as much as possible.
To work with the service, you need a so-called API key - a unique string of random characters, thanks to which the service can identify you. An example of such a key -8fc9b30e544885b8480fb590dfcbdd71
To get an API key, go to the site of the appropriate service. Check out the prices and conditions. If you have made your choice, go through a simple registration in the service and get your API key in the personal account of the service.
URL address for receiving API requests. Installed by default. If it is not installed, then it must be checked with the developers of the selected service.
Do not change the value of this field unnecessarily!
After entering the API key, your current balance on the service will appear in this field.
If after entering the API key this field remains empty, then some kind of error has occurred. Possible options - the wrong API key was entered, the service has a problem, your key has been banned.