Claim a configured free benefit or discount voucher as yourself

Reuse claimId on retry. A single-use offer returns the account's one claim, including after expiry; a multi-use offer returns the voucher the account holds now, and issues a new claim (new claimId) only once the previous one is used, expired or cancelled and uses remain (reward_uses_exhausted otherwise). Each claim takes one unit of stock. Expired unfulfilled leases release inventory automatically. Identity-required campaigns fail closed until a verified workflow exists; OCR or icHash never qualifies.

curl -X POST "https://example.com/v1/rewards/campaigns/497f6eca-6276-4993-bfeb-53cbbbba6f08/claim" \  -H "Content-Type: application/json" \  -d '{    "claimId": "88057929-7728-4a26-8396-f965dcc8b947",    "acceptRules": true  }'

{  "claim": {    "pointsSpent": 0,    "id": "497f6eca-6276-4993-bfeb-53cbbbba6f08",    "campaignId": "13f8bf6d-dc27-4a04-bffe-6e5b13c19ddf",    "deliveryKind": "physical_gift",    "status": "reserved",    "reservedAt": "2019-08-24T14:15:22Z",    "expiresAt": "2019-08-24T14:15:22Z",    "redeemedAt": "2019-08-24T14:15:22Z"  },  "availablePoints": 0}