curl --request DELETE \
  --url https://cerberus.eazybe.com/staging/api/v2/meta/phone-numbers/{phoneNumberId}/blocked-users \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "waIds": [
    "919900000009"
  ]
}
'

{
  "messaging_product": "whatsapp",
  "block_users": {
    "removed_users": [
      {
        "input": "919900000009",
        "wa_id": "919900000009"
      }
    ]
  }
}