iOS Signing Ipa file with new company certificate

[rossonero]

We have some IOS app developers who have made a app for IOS (IPA package). They have send the IPA file to me, and they have signed it with their own developer certificate - and say that we must sign it with our own, before we can deploy it.

I have a enterprise apple access and have a certificate - but how do I sign it with that ? . I have found many topics on this on google, but they seems to be outdated as many write

 

[PhoneyDeveloper]

I think the easiest way is if they send you the xcarchive package. You can place it in the folder where Xcode normally places them. You can then export the IPA file from Xcode as you had built it yourself.

Otherwise if you just have the IPA file you need to run several command line tools to unzip it, code sign it, and zip it again.

I guess there's some reason they don't give you the source code.