Is there any documentation about parameters I can use to configure sambapos?
I have seen a lot tutorials to do somethings using snippets like:
[=-1*TN(’{ENTITY BALANCE:Gift Certificate}’)]
[:GCAmount]
{QUANTITY} {NAME}|${TOTAL AMOUNT}
[:NumberpadValue]
etc…
is there any documentation where can found all this variables and command?
To offer you a more direct answer to your question, no there is not documentation listing all syntax. There are several tutorials some of them dealing with syntax usage as @qmckay has shown you. However you will be more likely to learn and retain more actual usage of syntax by just reading all the tutorials you can even if you dont plan on using the feature.