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Tests (1033 new lines, 100% coverage on modified functions): - amount.go: YuanToFen/FenToYuan with precision edge cases - wxpay: mapWxState, wxSV, formatPEM, NewWxpay validation - alipay: isTradeNotExist, NewAlipay validation - webhook: writeSuccessResponse (wxpay JSON, stripe empty, others text) - config: validateProviderRequest, isSensitiveConfigField, joinTypes - fulfillment: resolveRedeemAction idempotency logic Business logic changes: - Allow empty supported_types on provider instances - Block removing payment types when instance has pending orders - Extract resolveRedeemAction as testable pure function