Code is the minted referral code. Empty on a first apply — applying does not mint a code, approval does; a re-apply echoes whatever the row already holds.
Created says whether THIS call made the row. false means the org had already applied and nothing changed — no second row, no reset of an existing approval. The HTTP status states the same fact: 201 when true, 200 when false.
RateBps is the direct (level 1) commission rate the row carries, in basis points OF Hanzo's margin (2000 = 20% of margin, never of the customer's bill).