World Chain Payment API Guide: Mini Apps, WLD, and Stablecoin Flows
A developer-focused guide to payment flows in World App and World Chain, including Mini Apps, WLD, stablecoins, gas sponsorship, verification, and refunds.
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Blockchain Payments
Onchain payment architecture across wallets, tokens, network evidence, confirmation, and refunds.
Crypto Invoice API for Bitcoin, Ethereum, and Solana: A Practical Design
Design a multi-chain crypto invoice API with quotes, addresses, confirmations, webhooks, refunds, and chain-aware reconciliation.
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USDC Payment API Integration Guide: From Intent to Reconciliation
A step-by-step guide to USDC payment intents, deposit addresses, network selection, confirmations, refunds, webhooks, and treasury operations.
Read guide →Browse the complete Field Notes collection.
Explore all 10 implementation guides and their related payment architecture pages.