Create PushTopic

PushTopic pushTopic = new PushTopic();

 //Channel Name
pushTopic.Name = 'ProductUpdates';

//Define the query which will be used to create the payload
pushTopic.Query = 'SELECT Id, SKU__c, PackageType__c, ShelfLife__c FROM E_Product__c

pushTopic.ApiVersion = 42.0;

//Get Notification for all the fields
pushTopic.NotifyForFields = 'All';

/**** Optional, By Default all are true **/
pushTopic.NotifyForOperationCreate = true;
pushTopic.NotifyForOperationUpdate = true;
pushTopic.NotifyForOperationUndelete = true;
pushTopic.NotifyForOperationDelete = true;

insert pushTopic;