FixedPriceTransaction notification stopped working

[myretrostore-uk]

I've got a API setup  for FixedPriceTransaction which stopped working about 12 hours ago.  This has previosly been working for years with no code on my side recently done. 

The last successfull call was 08/04/2024 23:30 UK

Previously the API call contained all the selling information - GetItemTransactionsResponse,ShippingDetails etc. 

Now all I am seeing on the API call is the below with no details on the item sold. This has occured with each sale today so it's not a once off error.

Soapaction: "http://developer.ebay.com/notification/FixedPriceTransaction"
User-Agent: AsyncHttpClient/2.0.0.ebay.10092020

<?xml version='1.0' encoding='utf-8'?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Header><ebl:RequesterCredentials soapenv:mustUnderstand="0" xmlns:ns="urnapis:eBLBase>

 Is this a known issue? It's causing problems with all my sales. 

[myretrostore-uk · Accepted solution]

Found the issue. In my code I check if the call starts with 

<?xml version="1.0" encoding="UTF-8"?>

Looks like eBay have now changed the string to:

<?xml version='1.0' encoding='utf-8'?>

Which was causing a string mismatch.  I need to recode this as it's a bad practice but have done a workaround now by updating the string match.