The composer.json should be included in the installation zip.
Without it the usage of composer in modules is a bit more difficult because one needs to ensure that packages do not clash.
Thanks for your suggestion.
The composer.json and dependencies of WHMCS are owned and controlled by us based on the needs of the core software.
Modifying the packages distributed would could introduced untested packages and introduce instability.
Therefore this is not something we are planning to add at this time.
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