There are some undocumented variables that can be used in specific circumstances during form submissions.
SIGNING:
Variables available AFTER a form submit including a Signing.
$var:blip-sign.method$
$var:blip-sign.date$
$var:blip-sign.personalnumber$
$var:blip-sign.birthdate$
$var:blip-sign.age$
$var:blip-sign.name$
$var:blip-sign.email$ (only Freja eID)
$var:blip-sign.phoneNumbers$ (only Freja eID)
$var:blip-sign.addresses$ (only Freja eID)
$var:blip-sign.photo$ (only Freja eID)
PAYMENT:
Variables available BEFORE AND AFTER a form submit including a Payment.
$form:price$ (the current calculated price)
$form:coupons$ (the current calculated price in coupons if applicable)
Variables available AFTER a form submit including a Payment
$var:blip-payed.token$
$var:blip-payed.status$
$var:blip-payed.date$
$var:blip-payed.amount$
$var:blip-payed.currency$
$var:blip-payed.provider$
$var:blip-payed.reference$
$var:blip-payed.calc.days$
$var:blip-payed.method$
$var:blip-payed.email$
$var:blip-payed.phone$
IGLOOHOME
Variables available AFTER a form including an Igloohome unlock action
$var:blip-algoPin$
$var:blip-algoPinStartDate$