First-class fields are fields that contain user-specific data, such as account_number or first_name. The fields can be passed onto a wallet item either during install, using the tokens in the SmartLink URL or via an API call.

You can use these fields to personalize the content of your wallet item or as filter criteria when building reports.

Below is a list of the first-class fields you can use with our Wallet Manager APIs. All SmartLink personalization parameters as a URL query parameter will be accepted and stored. Note that the fields cannot be used as either a key identifier or as a filter for a Wallet Batch Update.

Field Name	SmartLink URL Personalization Format	Campaign UI Configuration Format	Type
email_address	data[email_address][email_address]	{{email_address}}	String
external_email_id	data[external_email_id][external_email_id]	{{external_email_id}}	String
first_name	data[first_name][first_name]	{{first_name}}	String
last_name	data[last_name][last_name]	{{last_name}}	String
code	data[code]	{{code}}	String
expiration_date	data[expiration_date][expiration_date]	{{expiration_date}}	Date Format: YYYY-MM-DDTHH:MM:SS+0:00
account_number	data[account_number][account_number]	{{account_number}}	String
balance	data[balance]	{{balance}}	String
tier	data[tier]	{{tier}}	String
offer_value	data[offer_value][offer_value]	{{offer_value}}	String
loyalty_tier	data[loyalty_tier][loyalty_tier]	{{loyalty_tier}}	String
loyalty_balance	data[loyalty_balance][loyalty_balance]	{{loyalty_balance}}	Float
strip_image_code	data[strip_image_code][strip_image_code]	{{strip_image_code}}	String

See how first class fields can be in the `tokens’ fields with Wallet Campaign API, Wallet Messaging API, and Wallet Batch Updates.