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+Group API Procedures
+====================
+
+## createGroup
+
+- Purpose: **Create a new group**
+- Parameters:
+    - **name** (string, required)
+    - **external_id** (string, optional)
+- Result on success: **link_id**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "createGroup",
+    "id": 1416806551,
+    "params": [
+        "My Group B",
+        "1234"
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 1416806551,
+    "result": 2
+}
+```
+
+## updateGroup
+
+- Purpose: **Update a group**
+- Parameters:
+    - **group_id** (integer, required)
+    - **name** (string, optional)
+    - **external_id** (string, optional)
+- Result on success: **true**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "updateGroup",
+    "id": 866078030,
+    "params": {
+        "group_id": "1",
+        "name": "ABC",
+        "external_id": "something"
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 866078030,
+    "result": true
+}
+```
+
+## removeGroup
+
+- Purpose: **Remove a group**
+- Parameters:
+    - **group_id** (integer, required)
+- Result on success: **true**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "removeGroup",
+    "id": 566000661,
+    "params": [
+        "1"
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 566000661,
+    "result": true
+}
+```
+
+## getGroup
+
+- Purpose: **Get one group**
+- Parameters:
+    - **group_id** (integer, required)
+- Result on success: **Group dictionary**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getGroup",
+    "id": 1968647622,
+    "params": [
+        "1"
+    ]
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 1968647622,
+    "result": {
+        "id": "1",
+        "external_id": "",
+        "name": "My Group A"
+    }
+}
+```
+
+## getAllGroups
+
+- Purpose: **Get all groups**
+- Parameters: none
+- Result on success: **list of groups**
+- Result on failure: **false**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getAllGroups",
+    "id": 546070742
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 546070742,
+    "result": [
+        {
+            "id": "1",
+            "external_id": "",
+            "name": "My Group A"
+        },
+        {
+            "id": "2",
+            "external_id": "1234",
+            "name": "My Group B"
+        }
+    ]
+}
+```