curl --request POST \
  --url https://grid.squads.xyz/api/grid/v1/accounts/{address}/external-accounts \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'x-grid-environment: <x-grid-environment>' \
  --data '
{
  "account": {},
  "beneficiary": {},
  "idempotency_key": "<string>",
  "is_third_party": true
}
'

{
  "active": true,
  "beneficiary_kind": "<string>",
  "beneficiary_name": "<string>",
  "country_code": "<string>",
  "created_at": "<string>",
  "currency": "<string>",
  "id": "<string>",
  "provider_accounts": [
    {
      "created_at": "<string>",
      "provider": "<string>",
      "provider_internal_id": "<string>",
      "rails": [
        "<string>"
      ],
      "status": "<string>",
      "last_error": "<string>"
    }
  ],
  "last_4": "<string>"
}