curl --request POST \
  --url https://traderapi.us-east-1.privatelink.preprod.polymarketexchange.com/auth/v1beta1/refresh_access_token \
  --header 'Content-Type: application/json' \
  --data '
{
  "refreshToken": "<string>"
}
'

{
  "accessExpirationTime": "2023-11-07T05:31:56Z",
  "accessIssueTime": "2023-11-07T05:31:56Z",
  "accessToken": "<string>"
}