It seems that MIGS (Mastercard Interface Gateway) is a niche topic and it's hard to find info on it. The developer / supporter is TNS but they don't seem to have support info or a forum on their site, probably because they sell to the Banks and then they rebrand it and provide it to customers. This forum post is about MIGS so you might be able to get some additional info there.
I suggest that you contact the Bank that you are using MIGS to connect to or contact TNS directly and ask them where you can get support.
chrishea
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