Add user data to the datalayer

[TorbenLundsgaard]

Request from the support forums.

[TorbenLundsgaard]

Including customer data in the data layer on the server side is problematic, as this could lead to an unfortunate data leak when usded with full-page caching. Cache-friendlyness is a high priority and therefor customer data will be implemented in 2 steps:

• On the 'purchase' event Add option to include include customer data on the purchase event. #126
• On all other relevant events

On all other events than 'purchase', the customer data must be included asynchronously and this is a big change to how the plugin is working right now. This is something that I want to do but it's not planned yet.

[ksaltik]

Is it possible to implement events that includes user data through Measurement Protocol.