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+API Category Procedures
+=======================
+
+## createCategory
+
+- Purpose: **Create a new category**
+- Parameters:
+- **project_id** (integer, required)
+    - **name** (string, required, must be unique for the given project)
+- Result on success: **category_id**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "createCategory",
+    "id": 541909890,
+    "params": {
+        "name": "Super category",
+        "project_id": 1
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 541909890,
+    "result": 4
+}
+```
+
+## getCategory
+
+- Purpose: **Get category information**
+- Parameters:
+    - **category_id** (integer, required)
+- Result on success: **category properties**
+- Result on failure: **null**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getCategory",
+    "id": 203539163,
+    "params": {
+        "category_id": 1
+    }
+}
+```
+
+Response example:
+
+```json
+{
+
+    "jsonrpc": "2.0",
+    "id": 203539163,
+    "result": {
+        "id": "1",
+        "name": "Super category",
+        "project_id": "1"
+    }
+}
+```
+
+## getAllCategories
+
+- Purpose: **Get all available categories**
+- Parameters:
+    - **project_id** (integer, required)
+- Result on success: **List of categories**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getAllCategories",
+    "id": 1261777968,
+    "params": {
+        "project_id": 1
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 1261777968,
+    "result": [
+        {
+            "id": "1",
+            "name": "Super category",
+            "project_id": "1"
+        }
+    ]
+}
+```
+
+## updateCategory
+
+- Purpose: **Update a category**
+- Parameters:
+    - **id** (integer, required)
+    - **name** (string, required)
+- Result on success: **true**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "updateCategory",
+    "id": 570195391,
+    "params": {
+        "id": 1,
+        "name": "Renamed category"
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 570195391,
+    "result": true
+}
+```
+
+## removeCategory
+
+- Purpose: **Remove a category**
+- Parameters:
+    - **category_id** (integer)
+- Result on success: **true**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "removeCategory",
+    "id": 88225706,
+    "params": {
+        "category_id": 1
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 88225706,
+    "result": true
+}
+```