Question about delayed settlement through Authorize.net

With my June Merchant Statement I had a notice that the presentation timeframe for Mastercard will be changed from 30 to 7 days. It stated to settle within 7 days or you could likely be subject to chargebacks for late presentment. They recommend to protect against chargebacks to settle promptly and if that is not possible to obtain a new authorization.

Most of the time I plan to settle promptly but there may be cases that it may be delayed and even cases where it could be delayed beyond 7 days. How is the best way to handle this?
Does VISA or Discover have a similar policy?
Most of all, if I have to go beyond 7 days how do I obtain a new authorization? Do I have to refund the purchase and then have the person pay again or can I somehow simply refund and do the payment again myself or even just simply somehow select reauthorize?

I am fairly new to this so I'm confused as to the best way to do this.

Most of those questions are something you'll need to ask your merchant account representative by calling their customer support line.

When using Authorize.net, Zen Cart cannot simply re-authorize a prior authorization, because Authorize.net does not offer that service in their programming guide. They might offer it via their own web console though. You'll have to ask them for recommendations for reauthorization.