In citation templates, could id=issn xxxx-xxxx be converted to issn=xxxx-xxxx.

Also add two format checks. This is optional. It is alright if it's not added to AWB as Citation Style 1 understands if it's not in the correct format. ISSN is "eight characters may be split into two groups of four using a hyphen, but not an en dash". So, convert:
ISSN=xxxxxxxx to ISSN=xxxx-xxxx
ISSN=xxxx xxxx to ISSN=xxxx-xxxx