[AlphaCommerceHub] Whether the «Administration» → «Merchant Profile» → «MID» value is related to the API Explorer's «MerchantID» value?

Extensions AlphaCommerceHub
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I have got an answer from the AlphaCommerceHub support:

Yes, that’s the value that goes into the API and HPP messages.

3

Another answer:

Yes. Will open a ticket to get that changed to align better.

4

If MID and MerchantID means the same, then why do I see different values of them in my merchant interface and in the API Explorer?
See the screenshots from my first post.

5

Because the API Developer Centre is a generic MID shared across different clients and you were assigned a specific MID for testing