Get Account Balance

{  "balance": "500.00"}

{  "error": {    "message": "Bad Request",    "code": 0,    "details": [      {        "issue": "The selected value is invalid.",        "field": "parameter"      }    ]  }}

{  "error": {    "message": "Unauthorized"  }}

{  "error": {    "message": "Forbidden"  }}

{  "error": {    "message": "Not Found"  }}

{  "error": {    "message": "Too Many Requests"  }}

{  "error": {    "message": "Service Unavailable"  }}