OptionaladditionalOptionalamountOptionaleventOptionaleventOptionalmerchantOptionalmerchantOptionaloperationsOptionaloriginalOn modification and dispute events: the ORIGINAL payment's reference. A
verified delivery may carry null here too; it reads as absent.
OptionalpaymentOptionalpspOptionalreasonOptionalsuccessThe STRING "true"/"false".
The payment's merchant reference. Adyen's schema types it as a string; a verified delivery may still carry
null, which reads as absent, as Adyen's own validators sign it.