"How can I confirm if my Visa card was used for an iPhone purchase?: i got money didcted form his Visa card for a mobile which had been bought from apple but it wasn’t me how can I know if he bought the phone or not"
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Apple Device Not Purchased By You:
Being suspicious, see if anything in your Apple Account looks unfamiliar.
A. Verify your Devices:
Verify that this device is not logged in to your account, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support. If it is, then someone may have access your account, and you should secure it, ASAP.
B. Modify your Credentials:
Having been unknowingly added, someone likely has your credentials. So, by all means, consider modifying them.