Use simplejson Decimal support

Modified imports and removed unused json imports
Modified calls to set use_decimal for serialization/deserialization

quickbooks/client.py

@@ -1,6 +1,6 @@
 import http.client as httplib
 import textwrap
-import json
+import simplejson as json
 import base64
 import hashlib
 import hmac
@@ -206,7 +206,7 @@ def make_request(self, request_type, url, request_body=None, content_type='appli
                 "Application authentication failed", error_code=req.status_code, detail=req.text)
 
         try:
-            result = req.json()
+            result = json.loads(req.text, use_decimal=True)
         except:
             raise exceptions.QuickbooksException("Error reading json response: {0}".format(req.text), 10000)
 

quickbooks/mixins.py

@@ -1,16 +1,14 @@
 from urllib.parse import quote
 
-try: import simplejson as json
-except ImportError: import json
+import simplejson as json
 
 from .utils import build_where_clause, build_choose_clause
 from .client import QuickBooks
 from .exceptions import QuickbooksException
 
-
 class ToJsonMixin(object):
     def to_json(self):
-        return json.dumps(self, default=self.json_filter(), sort_keys=True, indent=4)
+        return json.dumps(self, default=self.json_filter(), sort_keys=True, indent=4, use_decimal=True)
 
     def json_filter(self):
         """
@@ -178,7 +176,7 @@ def void(self, qb=None):
 
         data = self.get_void_data()
         params = self.get_void_params()
-        results = qb.post(url, json.dumps(data), params=params)
+        results = qb.post(url, json.dumps(data, use_decimal=True), params=params)
 
         return results
 
@@ -232,7 +230,7 @@ def delete(self, qb=None, request_id=None):
             'Id': self.Id,
             'SyncToken': self.SyncToken,
         }
-        return qb.delete_object(self.qbo_object_name, json.dumps(data), request_id=request_id)
+        return qb.delete_object(self.qbo_object_name, json.dumps(data, use_decimal=True), request_id=request_id)
 
 
 class DeleteNoIdMixin(object):

quickbooks/objects/payment.py

@@ -4,7 +4,6 @@
 from ..client import QuickBooks
 from .creditcardpayment import CreditCardPayment
 from ..mixins import DeleteMixin, VoidMixin
-import json
 
 
 class PaymentLine(QuickbooksBaseObject):