Looks like you are using Stripe subscription payments, but the webhook signing secret is missing from the plugin settings. Please go to the Stripe Settings menu and configure the webhook signing secret.
Version history
Only one revision of this notice has been captured so far. We'll diff it the moment the plugin ships a new wording.
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Simple Membership
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We're sorry to hear you aren't enjoying the Simple Membership plugin. We would love a chance to improve. Could you take a minute and let us know what we can do better by using our contact form?