curl --request POST \
  --url https://api.example.com/v1/bidder/request_withdrawals \
  --header 'Content-Type: application/json' \
  --data '
{
  "providers": [
    "<string>"
  ]
}
'

{
  "amounts": [
    "1000000000000000000"
  ],
  "providers": [
    "0x0000000000000000000000000000000000000000"
  ]
}