Recreating the Event Notification Email

Question

Is there a way to determine what the aid parameter is for a given event relation record?

We would like to add Invitee's to events and send a custom email notification to them allowing for the standard accept / decline process.

In the email the link includes an aid parameter which I assume is a hash of the event relation record?

Any help would be appreciated either with that or if someone has a better solution to send the invites via apex would be greatly appreciated.

Here si what the link looks like in the event invite sent by default from salesforce

https://cs7.salesforce.com/m/eventResponse.apexp?oid=00DM0000001xX25&aid=zKYSizeIGyMQKW33nan1bHtM1STDTQpGRjvDOv8h10A%3D

Answer 1

A bit late to the game but you can force salesforce to automatically send out the accept / decline email by setting the proper DML options when you insert the event relation (Invitee) records:

Database.DMLOptions dmo = new Database.DMLOptions();
dmo.EmailHeader.triggerUserEmail = true;
dmo.EmailHeader.triggerOtherEmail = true;

Database.insert(new EventRelation(EventId = e.Id, RelationId = user.Id), dmo);