Código API

Code(String)	Message(String)	SubCode(String)	SubMessage(String)	Desc
10000	Success
20000	Service Currently Unavailable
40001	Missing Required Arguments
40004	Method not supported
40005	MediaType not supported
40002	Business Failed	missing-signature-config	Signature configuration missing
40002	Business Failed	merchant-status-abnormal	Merchant is now invalid
40002	Business Failed	app-status-abnormal	App is invalid
40002	Business Failed	app-not-match	App not match
40002	Business Failed	invalid-signature	Signature is invalid
40002	Business Failed	no-method-supported	Method not supported
40002	Business Failed	currency-not-supported	Currency not supported
40002	Business Failed	duplicate-out_trade_no	out_trade_no is duplicate
40002	Business Failed	gen-card-token-fail	Gen card token fail
40002	Business Failed	card-token-expired	Card token expired
40002	Business Failed	bank-side-busy	Bank side busy

Para outros erros não listados aqui, consulte a efetiva devolução on-line.