I understand what you're saying, in fact I changed the grace period to 1 day but the problem is how many days before the renewal invoice is issued (default 7 days, which is also right to notify a user 7 days before a month to give him the opportunity to pay).
What's not good is that the subscription renewal date (since it's a monthly subscription) BECOMES the date you paid for, not the one set 30 days AFTER the subscription was created.
I'll give you an example:
The subscription includes a bonus of 100 files per month for the user.
Ip.nexus generates a renewal invoice after 3 weeks (so 1 week before the REAL expiration).
The user pays and the subscription is renewed IMMEDIATELY, without waiting for the remaining 7 days.
The user again receives the bonus of another 100 files per month, but in reality it will still take a week to finish the month.
And this only concerns the first renewal of the subscriptions, which is the situation I find myself in because I have just activated them, but I can't imagine what could happen with future renewals....