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Are the Site ID and Site Password fixed for WooCommerce DHL plugin?
Or can I change them with my custom values?
The credentials like username and password remain fixed in a live environment.
The Username and Passwords are the app ID and token, which should remain unchanged in the live environment.
Let us know if you need some help.
To explore more details about the plugins, go check out ELEX WooCommerce DHL Express / eCommerce / Paket Shipping Plugin with Print Label.
You can also check out other WooCommerce and WordPress plugins in ELEX.