curl --request GET \
  --url https://api.atlas.co/functions/v1/bank-accounts/{bank_account_id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "object": "bank_account",
  "customer_id": "<string>",
  "holder_name": "<string>",
  "account_type": "<string>",
  "last4": "<string>",
  "routing_last4": "<string>",
  "bank_name": "<string>",
  "country": "<string>",
  "currency": "<string>",
  "is_default": true,
  "verification_method": "<string>",
  "nickname": "<string>",
  "metadata": {},
  "created": 123
}