Preparation

For every whatsapp integration request needed a TOKEN and APPS URL.
TOKEN
You can get TOKEN from web administrator on Setting -> Whatsapp, and you can copy API Token from Connected Whatsapp Number you want to use.
Please make sure Whatsapp Number you are using is Connected.
APPS URL
You can get APPS URL from web administrator on Setting -> API Integration, and you must register your apps url first, then you can use it's domain url.
Please make sure Integated Apps on Active status.
RESPONSE
Some circumstances will resulting failed response for any request like below:
Failed (Token not provided)
{
    "success": false,
    "message": "Please provide a token"
}
Failed (Wrong Token or Token Invalid)
{
    "success": false,
    "message": "Token was invalid"
}
Failed (Apps URL not provided)
{
    "success": false,
    "message": "Please provide apps url"
}
Failed (Apps URL not registered)
{
    "success": false,
    "message": "Apps was not recognized, please check again"
}