Resources
Glossary
Outpay terms in plain language.
| Term | Definition |
|---|---|
| Base | The Ethereum layer-2 network used by the current payment matcher. |
| Checkout | A payment request and its hosted customer-facing flow. Also called a checkout session internally. |
| Checkout reference | The opaque identifier (chk_...) returned when a checkout is created. |
| Confirmation | Additional block depth confirmed after a transfer is included on-chain. |
| Currency | The token being transferred; v0.1 uses USDC exclusively. |
| Finality | Confidence that a transaction will not be reorganized off the canonical chain. Outpay's automated reorg handling is not verified. |
| Idempotency key | A merchant-generated key that lets checkout creation safely replay its original response instead of creating a duplicate. |
| Live mode | The API-key environment used for real, production-style merchant configuration. |
| Merchant webhook | A signed, outbound event delivered from Outpay to the merchant's server. |
| Non-custodial | Outpay does not hold funds; settlement is direct to the merchant's own wallet. |
| Overpayment | A transfer above the requested amount; a small tolerance is accepted, but remediation for a large overpayment is a beta concern — see payment lifecycle. |
| Payout wallet | The merchant-controlled address that receives every payment directly. |
| Test mode | The API-key environment intended for controlled integration testing. Not a separate blockchain sandbox. |
| Transaction hash | The blockchain identifier for a specific transfer. |
| Underpayment | A transfer below the requested amount. |
One canonical term per concept
This glossary uses one preferred term per concept throughout the documentation — for example, "payout wallet," not "withdrawal address" or "settlement wallet." If you see a synonym elsewhere, treat it as referring to the same thing defined here.
Related documentation
- Core concepts — the subset of these terms most relevant to a first integration.
- FAQ — short answers using this same terminology.