curl --request POST \
  --url https://api.sandbox.bitwage.com/api/user/payer/update \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "user_id": "<string>",
  "company_type": "employer",
  "payroll_invoice_currency": "EUR",
  "name": "<string>",
  "website": "<string>",
  "email": "jsmith@example.com",
  "external_company_id": "<string>",
  "occupation": "<string>",
  "payment_amount": "<string>",
  "street_address": "<string>",
  "street_address_2": "<string>",
  "city": "<string>",
  "region": "<string>",
  "zip": "<string>",
  "country": "<string>"
}
'

{
  "external_company_id": "<string>"
}