When I send API call to https://api.sandbox.paypal.com/v1/shipping/trackers-batch I got next error {"response":"[{\"name\":\"USER_BUSINESS_ERROR\",\"message\":\"Tracker Collection is Empty\",\"debug_id\":\"1966a3cd31dcb\",\"details\":[{\"location\":\"body\",\"issue\":\"TRACKER_COLLECTION_EMPTY\",\"description\":\"The request body is empty\"} I put in body array with trackers. What is wrong?
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