I am not sure what you are doing. More explanation would be very helpful - who is going to use your app and what are they going to do with it? I would start with DHL, not CPAN. Find out what interfaces and services DHL provides and then figure how to talk to what they prefer. Search for "DHL integration API". I found this: DHL Parcel API. I don't have any experience with DHL specifically, but there will be, with high probability, some kind of automated way to talk to DHL and they will encourage that! Figure out what you need to do as the first step. Then we can talk about how to get Perl to do what you need to do.
update: also perhaps DHL Developer Portal. Anyway, I would start with figuring out what DHL can and cannot do and matching that up with what you need to do and what you don't need to do. It sounds likely that some CPAN code could be useful although that may not be the case. I would run some of the examples shown in my first link and see what makes sense to you - in any event you will have to learn what JSON means and learn some of the buzzwords.
This is an intimidating first project in any language.
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