receiptInUseByOtherSubscriberError (error code 13): Receipt in use by another subscriber

• The code exists in the iOS enum, with the description "The receipt is in use by another subscriber", and in the React Native and Flutter enums (ErrorCode.swift).
• The backend-to-SDK mapping sends code 7102 to receiptAlreadyInUseError, not to this code (BackendErrorCode.swift). Nothing else in the iOS source raises code 13.
• The Android SDK enum has no member for code 13, so Android never reports it (PurchasesErrorCode.kt).
• An older SDK version or a wrapper that predates the mapping to code 7 may still raise it.

• Do not retry. The result stays the same until the account or the transfer setting changes.
• Tell the customer the purchase is linked to another account, without naming whose.
• Do not grant access from the error.

// Swift
do {
  let result = try await Purchases.shared.purchase(package: package)
} catch let error as ErrorCode where error == .receiptInUseByOtherSubscriberError {
  // handle receipt in use by another subscriber
}

On RevenueDot: RevenueDot answers backend code 7102 when another known user owns a purchase and the project's transfer behavior forbids moving it. The SDK reports that as receiptAlreadyInUseError (code 7), not as code 13. See receiptAlreadyInUseError.