They're different APIs and believe different purchases at PayPal so it'd depend entirely which you bought access to. Check the below within your PayPal account as it seams your account is not setup to block duplicate transactions, which would at least stop the double billing.
Looks like even if INVNUM is supplied if that setting isn't enabled PayPal won't block the duplicate transactions. We still need to investigate and fix the double payment attempt on our end, but for now that'll resolve your issue.
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This is now fixed in the latest CBSubs build available now. I however still recommend making sure your PayPal account also blocks duplicate invoice ids.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
Read FAQ thoroughly
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-- If you are a Professional, Developer, or CB Paid Subscriptions subscriber and have a support issue please always post in your respective support forums for best results!
-- If I've missed your support post with a delay of 3 days or greater and are a Professional, Developer, or CBSubs subscriber please
send me a private message
with your thread and will reply when possible!
-- Please note I am available Monday - Friday from 8:00 AM CST to 4:00 PM CST. I am away on weekends (Saturday and Sunday) and if I've missed your post on or before a weekend after business hours please wait for the next following business day (Monday) and will get to your issue as soon as possible, thank you.
-- My role here is to provide guidance and assistance. I cannot provide custom code for each custom requirement. Please do not inquire me about custom development.