Get a vendor

One vendor with 1099 readiness, TIN read state (hasTin; tinUnreadable when the stored ciphertext can no longer be decrypted), default expense account, checks (with paymentId), bills, payments (with bill allocations), and feedPayments (posted bank-feed and card-feed withdrawals coded to the vendor with no payment record: id, date, amount in positive cents, payee) so a client can render one joined history of every payment. Never returns TIN ciphertext or plaintext.