diff --git a/mifiel/base.py b/mifiel/base.py
index d92d9c2..5b29967 100644
--- a/mifiel/base.py
+++ b/mifiel/base.py
@@ -1,5 +1,6 @@
 from mifiel import Response
 import requests
+from os.path import basename
 
 class Base(object):
   def __init__(self, client, path):
@@ -22,12 +23,11 @@ def url(self, path=None):
 
     return self.client.url().format(path=p)
 
-  def process_request(self, method, url=None, data=None, file=None):
+  def process_request(self, method, url=None, data=None, files=None):
     if not url:
       url = self.url()
-
     if method == 'post':
-      response = requests.post(url, auth=self.client.auth, json=data)
+      response = requests.post(url, auth=self.client.auth, data=data, files=files)
     elif method == 'put':
       response = requests.put(url, auth=self.client.auth, json=data)
     elif method == 'get':
diff --git a/mifiel/document.py b/mifiel/document.py
index e2d0d02..a1d47be 100644
--- a/mifiel/document.py
+++ b/mifiel/document.py
@@ -17,14 +17,22 @@ def create(client, signatories, file=None, dhash=None, callback_url=None):
     if file and dhash:
       raise ValueError('Only one of file or hash must be provided')
 
-    data = { 'signatories': signatories }
+    sig_numbers = {}
+
+    for index, item in enumerate(signatories):
+      for key, val in item.iteritems():
+        sig_numbers.update({'signatories['+str(index)+']['+str(key)+']':val})
+
+    data = sig_numbers
+
     if callback_url:
       data['callback_url'] = callback_url
     if file:
-      data['file'] = open(file)
+      _file = open(file, 'rb')
+      file = {'file':(basename(_file.name), _file, 'application/pdf')}
     if dhash:
       data['original_hash'] = dhash
 
     doc = Document(client)
-    doc.process_request('post', data=data)
+    doc.process_request('post', data=data, files=file)
     return doc