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January 23, 2020 at 2:37 am

As far as my understanding of reading that code goes, it should populate the user’s system fields from the values that may exist in Event Espresso. Is my understanding correct?

No.

That code pulls values from the EE_Contact linked to the current WP user that is logged in and auto-fills the address questions on the registration form.

The easiest way to highlight which values they are is with a screenshot: https://monosnap.com/file/Vfnc49XC8GQzeqjhZQgizJX6GzBjbN

Event Espresso -> Registrations -> Contact list -> {click on the contact linked to the user}

The address questions there are the ones being pulled and autofilled on the registration form using that snippet.

All registrations made in EE are connected with a ‘EE_Contact’ object, that is created from the values in the registration form when a registration is made. EE will check its current EE_Contacts for any that match the first name, last name and email address exactly when a registration is made, if it finds one it links the registration to that contact rather than creating another.

The WP User integration add-on sets up a relationship with the logged-in WP user account and EE contact create/found during the registration they make.

So the code about is simply saying:

1. Pull the EE_Contact linked to the current user.
2. If we have an EE_Contact object (you may not always have one) pull the address questions from that contact and autofill them on the address group.

Note that other than the connection between the WP User account and then EE_Contact (which is important) the WP User account details don’t come into it.

You could modify that snippet to pull the values directly from the WP User account if preferred, if those are different from the values set on the contact linked at the time they will be updated on submission.