Credit History
Sample API
                    http://api.msg91.com/api/credit_history.php?authkey=YourAuthKey
Note:  Returns credit history if auth key is correct or the appropriate error message 
                    | Parameter Name | Value | Description | 
|---|---|---|
| authkey * | alphanumeric | Login authentication key (this key is unique for every user) | 
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| Authentication key: | 
                        
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