Here is a list of custom values you may find in your system:
Contact > Full name: {{contact.name}}
Contact > First name: {{contact.first_name}}
Contact > Last name: {{contact.last_name}}
Contact > Email: {{contact.email}}
Contact > Phone: {{contact.phone}}
Contact > Company name: {{contact.company_name}}
Contact > Full Address: {{contact.full_address}}
Contact > Address 1: {{contact.address1}}
Contact > City: {{contact.city}}
Contact > State: {{contact.state}}
Contact > Postal Code: {{contact.postal_code}}
Contact > Date of Birth: {{contact.dateofbirth}}
Contact > Source: {{contact.source}}
Contact > Website: {{contact.website}}
User > Full Name: {{user.name}}
User > First Name: {{user.first_name}}
User > Last Name: {{user.last_name}}
User > Email: {{user.email}}
User > Phone: {{user.phone}}
User > Signature: {{user.email_signature}}
User > Calendar Link: {{user.calendar_link}}
User > Twilio Phone: {{user.twiliophonenumber}}
Appointment > Start Date Time: {{appointment.start_time}}
Appointment > Start Date: {{appointment.onlystartdate}}
Appointment > Start Time: {{appointment.onlystarttime}}
Appointment > End Date Time: {{appointment.end_time}}
Appointment > End Date: {{appointment.onlyenddate}}
Appointment > End Time: {{appointment.onlyendtime}}
Appointment > Timezone: {{appointment.timezone}}
Appointment > Cancellation Link: {{appointment.cancellation_link}}
Appointment > Reschedule Link: {{appointment.reschedule_link}}
Appointment > Meeting Location: {{appointment.meeting_location}}
Appointment > Notes: {{appointment.notes}}
Appointment >Add to Google Calendar: {{appointment.addtogoogle_calendar}}
Appointment > Add to Ical&Outlook: {{appointment.addtoical_outlook}}
Calendar > Name: {{calendar.name}}
Campaign > Event, Date, Time: {{campaign.eventdatetime}}
Campaign > Event Date: {{campaign.event_date}}
Campaign > Event Time: {{campaign.event_time}}
Message > Message Body: {{message.body}}
Account > Name: {{location.name}}
Account > Full Address: {{location.full_address}}
Account > Address Line 1: {{location.address}}
Account > City: {{location.city}}
Account > State: {{location.state}}
Account > Country: {{location.country}}
Account > Postal Code: {{location.postal_code}}
Account > Email: {{location.email}}
Account > Phone: {{location.phone}}
Account > Website: {{location.website}}
Account > Logo URL: {{location.logo_url}}
Account > Owner > First Name: {{locationowner.firstname}}
Account > Owner > Last Name: {{locationowner.lastname}}
Account > Owner > Email: {{location_owner.email}}
Right Now > Second: {{right_now.second}}
Right Now > Minute: {{right_now.minute}}
Right Now > Time 24h Format: {{right_now.hour}}
Right Now > Time AM/PM Format: {{rightnow.hourampm}}
Right Now > AM/PM: {{right_now.ampm}}
Right Now > Day: {{right_now.day}}
Right Now > Month: {{right_now.month}}
Right Now > Month Extended English: {{rightnow.monthenglish}}
Right Now > Year: {{right_now.year}}
Right Now > Date (month/day/year): {{rightnow.middleendian_date}}
Right Now > Date (day/month/year): {{rightnow.littleendian_date}}