Hi, currently the module use drupal_set_message() to print error messages. Those errors are already logged using watchdog, the user message error should at least respect the global Drupal error messages settings (admin/config/development/logging). What do you think about?
Needs review
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
It might make sense to do something similar to logging mailchimp_ecommerce_log_error_message().
Maybe: \Drupal::service('mailchimp_ecommerce.helper')->addErrorMessage();
Then it would be easy to add one check / setting to display all error messages. It looks like all of the messenger addError calls are for API error messages.