Status 400 - bad_request: "Bad JSON format”

_{

   _{"message": "Bad JSON format -> utils.converters.exceptions.ConverterException: utils.converters.JSON: Error parsing json: {\n  \"additional_info\": {\n    \"items\": [\n      {\n        \"id\": \"1\",\n        \"title\": \"Point Mini\",\n        \"description\": \"Point product for card payments via Bluetooth.\",\n        \"installments\": 1,\n  \"metadata\": null,\n  \"payer\": {\n    \"entity_type\": \"individual\",\n    \"type\": \"customer\",\n    \"email\": \"test_user_851323980@testuser.com\"\n  },\n  \"payment_method_id\": \"master\",\n  \"token\":\"f1ca53f1ced59919f2eb954e5d94cea9\",\n  \"transaction_amount\": 23,\n})",}

   _{"error": "bad_request",}

   _{"status": 400,}

   _{"cause": []}

   _}