While writing an email or notification, you'll see a table of variables. Click one to add it to the message, and each client receives their own value.

For example, if you write _Hi {first_name}_, María gets "Hi María" and Carlos gets "Hi Carlos".

The most used ones

VariableReplaced with
{first_name}First name
{last_name}Last name
{name}Full name
{alias}Alias
{email}Email
{phone}Phone
{unique_number}Client number
{date_of_birth}Date of birth

Your custom fields have their own variable too, for example {custom_objetivo}.

Important: if a client hasn't filled in a field, the variable stays empty. That's why it's best not to start the subject with a variable.