Fatal error: Uncaught Error: Interface "Magento\InstantPurchase\PaymentMethodIntegration\AvailabilityCheckerInterface" not found in /home/airtimer/public_html/vendor/magento/module-instant-purchase/PaymentMethodIntegration/Integration.php:14 Stack trace: #0 {main} thrown in /home/airtimer/public_html/vendor/magento/module-instant-purchase/PaymentMethodIntegration/Integration.php on line 14