Implement exchange delete API

hasher-matcher-actioner/src/OpenMediaMatch/blueprints/curation.py

@@ -431,20 +431,22 @@ def exchange_update(exchange_name: str):
 def exchange_delete(exchange_name: str):
     """
     Delete exchange configuration
+
     Inputs:
-     * Configuration name
-     * (optional) whether to also delete the associated bank (defaults to true)
+     * Exchange name
 
     Returns:
     {
-      "message": "success",
+      "message": "Exchange deleted",
     }
     """
     storage = persistence.get_storage()
     collab = storage.exchange_get(exchange_name)
     if collab is None:
-        return {"message": "success"}
-    abort(501, "Not yet implemented")
+        abort(404, f"exchange '{exchange_name}' not found")
+
+    storage.exchange_delete(exchange_name)
+    return {"message": "Exchange deleted"}
 
 
 # Signal Types

hasher-matcher-actioner/src/OpenMediaMatch/tests/test_api.py

@@ -163,3 +163,26 @@ def test_compare_hashes(app: Flask, client: FlaskClient):
             json=bad_input,
         )
         assert resp.status_code == 400
+
+
+def test_exchange_delete(app: Flask, client: FlaskClient):
+    delete_response = client.delete(
+        "/c/exchange/TEST_EXCHANGE",
+    )
+    # test exchange not found
+    assert delete_response.status_code == 404
+    assert delete_response.get_json()["message"] == "exchange 'TEST_EXCHANGE' not found"
+
+    # create an exchange
+    post_response = client.post(
+        "/c/exchanges",
+        json={"api": "sample", "bank": "FOO_EXCHANGE", "api_json": {}},
+    )
+    assert post_response.status_code == 201
+
+    # test a successful delete
+    delete_response = client.delete(
+        "/c/exchange/FOO_EXCHANGE",
+    )
+    assert delete_response.status_code == 200
+    assert delete_response.get_json()["message"] == "Exchange deleted"