Error getting pay key / Can't connect with PayPal

If you have connected your PayPal a year ago, the pay key may have expired as PayPal allow us to use it for max 1 year. Please disconnect and reconnect your PayPal in your Subliminator payment setings.
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You can do so by going to Subliminator → Billing → Billing Methods → Remove current PayPal billing method and re-add it again.