Find the evidence due date on the dispute, read the reason, and decide whether to fight. Predispute is free to install.
Shopify and Stripe each show the date your evidence is due on the dispute itself. It is usually 7 to 21 days away, and a missed date loses the case.
The reason tells you what the bank will check. A not-received claim turns on delivery records, and a fraud claim on the buyer's past orders and device.
Shopify and Stripe won't let you refund a charge while the dispute is open, and a refund made before it doesn't stop it. The choice now is fight or accept.
Fight when your evidence is good and the amount is worth it. Otherwise accept it and spend the time on the disputes that matter.

Predispute does the first two steps for you.
Install it on Shopify or Stripe and Decide lists every open dispute with its reason and the date your evidence is due. It weighs your odds against the amount and the fees, then says fight or accept on a filed chargeback, or refund at the inquiry stage, with the arithmetic shown. For the ones worth fighting, Fight drafts the letter for you to send. Measure is free and shows your dispute rate on every card brand.
When a chargeback is worth fighting explains how that decision is made.
Measure is free. Decide adds a recommendation on every dispute.