User ID

You can identify a user in the VWO SDK using a string which identifies that user.
User Id can be set in the VWO Launch config.

User Id helps VWO identify a user across multiple devices, it allows us to serve the same variation to a user thus keeping the experience consistent.

For example, you may run a campaign on both iPhone and iPad. If a user uses both the iPhone app and iPad app, setting the user id will allow us to serve the same variation for a campaign.

String id = "<uuid-for-the-user>";
VWOConfig vwoConfig = new VWOConfig.Builder().userID(id).build();

VWO.with(this, VWO_API_KEY).config(vwoConfig).launch(null);
val id = "<uuid-for-the-user>"
val vwoConfig = VWOConfig.Builder().userID(id).build()

VWO.with(this, VWO_API_KEY).config(vwoConfig).launch(null)

Please note that altering the traffic allocation among variations or total campaign traffic can break this. Also, changing targetting while the campaign is running is also not advisable.


Please note

User ID is used as hash and is not stored anywhere on the device or server.