BaseKt payment SPI: PaymentProvider, exact multi-decimal amounts, and optional capabilities for webhooks, on-chain receipts, refunds and payouts.

BaseKt in-memory payment provider: sessions, signed webhooks, simulated on-chain transfers, refunds and payouts for tests and prototypes.

BaseKt payments: install(BaseKtPayments), multi-provider checkout, webhook and on-chain verification, atomic replay protection, refunds and payouts.

BaseKt commerce: an optional umbrella over the modules for selling online.

BaseKt Kaia payment provider: Ktor HttpClient JSON-RPC verification of KIP-7/ERC-20 (USDT) transfers, log scanning and gas-checked payouts.

BaseKt Lemon Squeezy payment provider: JSON:API checkouts, subscription customer portal lookup and constant-time X-Signature webhook verification over Ktor HttpClient.

BaseKt Paymentwall payment provider: Signature v3 Digital Goods and subscription checkout URLs, IP-allowlisted pingback verification and plain-text OK responses.

BaseKt PayMongo payment provider: Checkout Sessions, Payment Links, Refunds and Paymongo-Signature webhook verification.