If it is an Apple charge or subscription, you will see it here and also request a refund:
View your purchase history for the App Store and other Apple media services - Apple Support
View or cancel app subscriptions on iPhone - Apple Support
It is likely that you won't see it there and that means it was not an Apple charge and you were charged directly from a website. The StarsApp charge is likely associated with an Astrology or Palm Reader site where users were directed to the website from a Social Media post or advertisement and got a free reading. In the fine print it also says that the reading came with a subscription to their horoscope service. Check your emails for any related communication as the company name changes along with the procedure to cancel. Yes, it is a scam website. Other users who have been hit with this same scam have used this link to unsubscribe: https://astrologia.world/lpr2/unsubscription. For a refund, contacting your bank may be the best option.
Please update if you were able to confirm if it was an Apple charge or billed directly to you from a website. Also if you have any additional information if you were directed to a horoscope site as described. Depending on the information you have, there may be more that can be done such as reporting of the fraudulent website if that is the case.