NPA-5880: Update docs and requests

Author: ClarksonAdam

postman/INT.postman_environment.json

@@ -21,13 +21,13 @@
 			"enabled": true
 		},
 		{
-			"key": "private_key",
+			"key": "vrs_api_private_key",
 			"value": "",
 			"type": "secret",
 			"enabled": true
 		},
 		{
-			"key": "api_key",
+			"key": "nhs_developer_account_api_key",
 			"value": "",
 			"type": "secret",
 			"enabled": true
@@ -63,7 +63,8 @@
 			"enabled": true
 		}
 	],
+	"color": null,
 	"_postman_variable_scope": "environment",
-	"_postman_exported_at": "2025-12-01T17:15:19.423Z",
-	"_postman_exported_using": "Postman/11.68.4"
+	"_postman_exported_at": "2025-12-05T12:22:03.035Z",
+	"_postman_exported_using": "Postman/11.74.2"
 }