I was able to generate the code generation and the verifier digit of the label, however the post office asks for a unique pattern for printing and I do not know if sigep-web already provides this in its API or not.
There is the link above that is a library where I can perform the label printing according to the requirements of the post, but it is in PHP, does anyone know something of the type aimed at NodeJS? I need to be generating the PDF to print the label and I believe that putting this layout together is not the best way.
I accept constructive suggestions of course, why if I do not find anything geared towards nodejs I will have to develop.