{
    "massActions": {
        "update": {
            "implementationClassName": "Espo\\Modules\\Crm\\Classes\\MassAction\\Opportunity\\MassUpdate"
        }
    },
    "mandatoryAttributeList": [
        "accountId",
        "accountName"
    ],
    "beforeUpdateHookClassNameList": [
        "Espo\\Modules\\Crm\\Classes\\RecordHooks\\Opportunity\\BeforeUpdate"
    ]
}
