To demon191 Thank you for your response. So there is indeed a linking issue, I'll keep an eye on the linked thread!

I apologize for the delayed response and thank you for your message. To provide additional information, our app is a free-to-download application with a single monthly subscription option, and subscription sharing is not enabled. We have not received any receipt verification requests in our system, so we assume that no charges have been made. However, since iOS6 is no longer supported, we are unable to verify this, leaving us at a dead end. In cases like this receipt, can we conclude that no charges have been made?