okx/okx-agent-payments-protocol
Unified payment dispatcher for agent-to-service payments. Covers x402 (exact, exact+Permit2, upto, aggr_deferred schemes), MPP (charge / session intents), and a2a-pay (a2a_charge paymentId flow). Detects HTTP 402 from response headers and routes to the matching scheme reference; also handles a2a paymentId mentions without a 402. Loads references/{exact,aggr_deferred,upto,charge,session,a2a_charge}.md. Returns a ready-to-paste authorization header (x402/MPP) or a tx-hash + status (a2a). Triggers (EN): 402, payment required, x402, x402Version, X-PAYMENT, PAYMENT-REQUIRED, PAYMENT-SIGNATURE, permit2, upto, metered billing, open/close/topup/settle channel, voucher, session payment, channelId, channel_id, paymentId, a2a_, create payment link, payment link, payment status. Triggers (中文): 按量计费、支付上限、支付通道、关闭/充值/续费/结算通道、关闭会话、结算会话、凭证、会话支付、付款链接、创建支付、支付状态. Any close/topup/settle/voucher/refund near a channel_id or session context = MPP mid-session op → load references/session.md.