Environment

Backend environment variables (SuiOutKit operators only).

Not required for SDK integration. This page is for teams operating or running the SuiOutKit backend. Merchants only need `merchantAddress` in the SDK - see Installation.

Configure these values in backend/.env (see backend/.env.example). The table below separates core operator values from optional provider and storage settings. Keep operator private keys and provider secrets out of client-side code.

Core

Variable	Description
`PORT`	HTTP port (default `5000`)
`REDIS_MODE`	`local` (standalone Redis via `ioredis`) or `live` (Upstash REST)
`REDIS_URL`	Redis connection string (used when `REDIS_MODE=local`)
`REDIS_HOST`, `REDIS_PORT`	Redis host/port override (optional, default `localhost:6379`)
`REDIS_PASSWORD`	Redis password / Upstash token
`REDIS_TLS_ENABLED`	Set `true` to enable TLS (Upstash)
`SESSION_TTL`	Checkout session expiry in seconds (default `1800`)

Minimum for local development

For a quick local run you typically need at least:

PORT=5000
REDIS_MODE=local
REDIS_URL=redis://localhost:6379
SUI_NETWORK=testnet
SUPPORTED_COINS='{"SUI":{"type":"0x2::sui::SUI","coingeckoId":"sui","decimals":9}}'

Operator-only values (Sui keys, WALRUS keys, provider secrets) are required for a production deployment. See backend/.env.example for full list and example values.

Payment providers

Variable	Description
`FLW_API_BASE`	Flutterwave API base URL
`FLW_PUBLIC_KEY`	Flutterwave public key
`FLW_SECRET_KEY`	Flutterwave secret
`FLW_HASH`	Webhook verification hash
`STRIPE_PUBLIC_KEY`	Stripe publishable key
`STRIPE_SECRET_KEY`	Stripe secret
`STRIPE_WEBHOOK_SECRET`	Stripe webhook signing secret

Notes:

Use Stripe test keys for development and sk_live... keys in production. Keep STRIPE_SECRET_KEY and STRIPE_WEBHOOK_SECRET server-side only.
For Flutterwave, FLW_SECRET_KEY should start with FLWSECK (Test or Live). FLW_HASH is used to validate incoming webhooks.

Sui

Variable	Description
`SUI_RPC_ENDPOINT`	JSON-RPC endpoint (used by indexer for `suix_queryEvents` polling)
`SUI_GRPC_ENDPOINT`	gRPC endpoint (used by SuiGrpcClient for Payment Kit flows)
`SUI_NETWORK`	`testnet` or `mainnet`
`PACKAGE_ID`	Published suioutkit Move package
`PAYMENT_KIT_PACKAGE_ID_testnet` / `PAYMENT_KIT_PACKAGE_ID_mainnet`	Payment Kit registry package (required for outPay flow)
`TREASURY_ID`	Treasury shared object
`TREASURY_ADMIN_CAP_ID`	Optional - TreasuryAdminCap object ID (skips wallet scan on treasury scripts)
`FIAT_REGISTRY_ID`	Payment Kit registry (fiat)
`FIAT_REGISTRY_ADMIN_CAP_ID`	Registry admin cap
`FIAT_REGISTRY_NAME`	Registry name string (e.g. `suioutkit-fiat-settlements`)
`CRYPTO_REGISTRY_ID`	Registry (crypto flows)
`CRYPTO_REGISTRY_NAME`	Registry name string
`CRYPTO_REGISTRY_ADMIN_CAP_ID`	Crypto admin cap
`SUPPORTED_COINS`	JSON map of settlement coins. Format: `{"SYMBOL":{"type":"<full_coin_type>","coingeckoId":"<coingecko_id>","decimals":<int>}}`. Example: `{"SUI":{"type":"0x2::sui::SUI","coingeckoId":"sui","decimals":9},"USDC":{"type":"0x...::usdc::USDC","coingeckoId":"usd-coin","decimals":6}}`
`DEFAULT_COIN`	Symbol of the default settlement coin (default `SUI`)
`SETTLEMENT_TOKEN_TYPE`	Legacy - fallback when `SUPPORTED_COINS` is not set. Use `SUPPORTED_COINS` instead.
`SUI_OPERATOR_PRIVATE_KEY`	Signs settlement PTBs

Notes:

SUI_OPERATOR_PRIVATE_KEY must be kept secret. The backend accepts either bech32 (suiprivkey1...) or hex-prefixed (0x...) formats; ensure your operator wallet has SUI for gas.
PACKAGE_ID, TREASURY_ID, and registry IDs are populated when you deploy the Move package and bootstrap registries - see contracts/suioutkit/ and the Developer Guide for deploy steps.

Walrus

Variable	Description
`WALRUS_UPLOAD_MODE`	`publisher` or `sdk`
`WALRUS_EPOCHS`	Storage epochs
`WALRUS_DELETABLE`	Allow blob deletion (default `false`)
`WALRUS_PUBLISHER_URL`	Publisher URL (testnet/mainnet)
`WALRUS_USE_UPLOAD_RELAY`	Enable upload relay fallback
`WALRUS_UPLOAD_RELAY_URL`	Upload relay endpoint
`WALRUS_UPLOAD_RELAY_MAX_TIP`	Max tip for relay upload
`WALRUS_OPERATOR_PRIVATE_KEY`	Required when `WALRUS_UPLOAD_MODE=sdk`

Notes:

WALRUS_UPLOAD_MODE=publisher lets you use the public Walrus publisher endpoint (no operator key needed). sdk mode requires WALRUS_OPERATOR_PRIVATE_KEY and SUI/WAL funds for registering blobs.

Troubleshooting

Issue	Check
Treasury abort code 4	Fund treasury for the settlement coin type (see `SUPPORTED_COINS`)
FX falls back to ~1300	FX upstream unreachable
Walrus upload fails	Try upload relay or publisher mode

If you are operating the backend in production, follow the Developer Guide (/docs/developer-guide) for deployment checklists (keys, secure env, and Sui object IDs). Always rotate and protect private keys.