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Problem:
The client was charged twice for the same service, once through PayPal and once with a credit card, due to the PayPal transaction initially not appearing to go through.
Solution:
If you're experiencing a similar issue. Please contact us https://wpml.org/home/contact-us/contact-form/

This solution might be irrelevant if it's outdated or not applicable to your case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If this does not resolve your issue, please open a new support ticket at WPML support forum.