idmsa.apple.com seems to have been duplicating my subscriptions. is this site authentic?

Re: "idmsa.apple.com seems to have been duplicating my subscriptions. is this site authentic"?

As you already feel suspicious of these charges, that is a good indication they may be false.

While the idmsa address is associated with Apple, scammers may or may not be involved.

To see what charges Apple itself has really made you can view your purchase history:

See what to do: If you see 'apple.com/bill' on your billing statement - Apple Support

If your payment method was actually charged:

You may see some info. about who made the charges on your payment provider's statement.

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Re:idmsa.apple.com: is this site authentic?

There's some great info. about tthe authentic "idmsa.apple.com" and what it is in this discussion thread.: what is idmsa.apple.com - Apple Community

Eg: says:

"IDMSA (full name idmsa.apple.com) is the name of the guard shack placed at the conceptual network security fence built around Apple and Apple services, and you will have to present your identification badge and your secret passcode to the guard to be permitted access within parts of the fenced perimeter at Apple. IDMSA is what you authenticate to."

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Re: Some of My subscriptions and payments are duplicated?

These two "User Tip" articles from respected community members may be helpful:

Billed, but you didn’t buy? - Apple Community

and

How to Spot Real Apple Communication and … - Apple Community

idmsa.apple.com is Apple's secure server login for these forums.

Other than that, I have no idea what you mean by duplicating your subscriptions.