Would your customer recognize this charge?

Visa gives the merchant name field 25 characters, counting letters, spaces and symbols. Stripe is stricter and caps the complete descriptor at 22, including the asterisk and any spaces, with a static prefix of 2 to 10 characters. Build for 22 and you satisfy both.

For card-absent transactions, yes. Visa requires the merchant city field to carry your customer service telephone number, your URL, or an internet or email address. That field is 13 characters. Most merchants leave a city name there, which is not compliant and leaves the customer with nobody to call except their bank. One caveat on the phone number: only use one somebody actually answers. A dead line is worse than no number at all, because the next call goes to their bank instead. For most subscription businesses a short URL that lands on a real support page is the safer choice.

Yes, and almost nobody does. Visa permits the first recurring charge after a trial, discounted introductory offer or promotional period to append language to the merchant name, such as End Trial, End Free Trial, End Offer or End Discount. Visa's own example is MERCHANTNAME END TRIAL. It is the cheapest way to stop a converted trial being reported as fraud.

Mainly Visa 10.4 and Mastercard 4837, where the customer says they did not authorize a charge they actually made, and Mastercard 4863, which is literally called Cardholder Does Not Recognize. If your trial terms are the problem rather than the name, it shows up as Visa 13.5. All of those are preventable before the dispute is filed.

No. Visa requires long names to be abbreviated rather than truncated, and specifically requires that the part of the name which identifies you to the cardholder is the part you keep. Cutting the end off a name usually removes the recognizable half.