Updated Transaction Upload API (markdown)

Transaction-Upload-API.md

@@ -15,9 +15,9 @@ The JSON can be one of the following types:
 * Known but Unvalidated Organisation
 * Unknown Organisation
 
-### Known and Validated Organisation
+### Request JSON
 
-Request JSON
+#### Known and Validated Organisation
 
 ```
 {
@@ -28,7 +28,7 @@ Request JSON
 }
 ```
 
-### Known but Unvalidated Organisation
+#### Known but Unvalidated Organisation
 
 ```
 {
@@ -39,7 +39,7 @@ Request JSON
 }
 ```
 
-### Unknown Organisation
+#### Unknown Organisation
 
 ```
 {
@@ -54,3 +54,38 @@ Request JSON
 ```
 
 **Note** `street_name` and `postcode` are optional.
+
+### Response JSON
+
+#### Success
+
+Response code of `200 OK`
+
+```
+{
+  success : true,
+  message : 'Upload Successful'
+}
+```
+
+#### Failure
+
+If something is missing from the request, or is invalid, you will get a response code of `400 BAD REQUEST` and the following:
+
+```
+{
+  success : false,
+  message : <error message>
+}
+```
+
+If there was a server error, you will get a `500 SERVER ERROR` and possibly the following:
+
+```
+{
+  success : false,
+  message : 'An unknown error occurred when adding the transaction'
+}
+```
+
+The error messages should describe what was wrong with the submission