Oracle 12.2 : Is there a way to copy pdb from one server to another in production env
The hot cloning of PDBs is a new feature introduced in 12.2.

Cloning a PDB


  Cloning of a pluggable database (PDB) resolves the issue of setting
  the source system to read-only mode before creating a full or snapshot
  clone of a PDB. With this feature, you can now clone your production
  PDBs and create point-in-time copies for development or testing
  without any application outage.
  
  This feature eliminates the need to create application outages for the
  purpose of cloning.


So the PDB in question can be easily cloned without downtime, then the customer can send you the clone PDB.