curl --request GET \
  --url https://api.sandbox.bitwage.com/api/user/payer/list \
  --header 'Authorization: Basic <encoded-value>'

{
  "payers": [
    {
      "external_company_id": "<string>",
      "name": "<string>",
      "email": "<string>",
      "company_type": "<string>",
      "payroll_invoice_currency": "<string>",
      "website": "<string>"
    }
  ]
}