Type Alias: ContactId
ContactId:
Brand
<`${AccountNumber}@${ChatServer}`,"ContactId"
>
A contact id ends with @c.us
and only contains the number of the contact. For example, if the country code of a contact is 44
and their number is 7123456789
then the contact id would be 447123456789@c.us
Example:
"447123456789@c.us"