Thanks for your checking with the teams @not_here and getting back to me - much appreciated. I have some follow-on questions which I was hoping you might be able to help with. Specifically, if a user is part way through an existing subscription and they modify their subscription (using modify=1 or modify=2): Is the old subscription cancelled immediately or will it run until the end of the billing cycle? When that old subscription is cancelled will we receive the normal subscr_cancel and subscr_eot IPN notifications? Is the new subscription setup immediately? Is payment take for the new subscription immediately? How is payment for the new subscription calculated - is it a pro-rata'd payment, or the full cost of the new subscription? Is a subscr_signup IPN notification sent for the new subscription? Also, please can you ask the development team to consider making this change available for testing in the Sandbox ahead of the rollout to production? This is a breaking change to the API, and for merchants to have our first visibility of the change in production is not ideal. We can make changes to our applications to anticipate these changes, but it is highly risky for us not to be able to test those changes.
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