curl --request GET \
  --url https://api.linkio.world/otc/business_customers \
  --header 'ngnc-sec-key: <api-key>'

{
  "code": "GET_SUCCESSFUL",
  "message": "Customers retrieved.",
  "data": [
    {
      "customer_id": "<string>",
      "customer_name": "<string>",
      "customer_email": "<string>",
      "customer_phone": "<string>",
      "customer_address": "<string>",
      "customer_country": "<string>",
      "status": "<string>"
    }
  ]
}