Google Translate VBA Function

[beardguy]

I am working on creating an Excel UDF that translates a specified language to another specified language. I previously used a few various sections of code I leveraged from various websites and my limited knowledge of VBA to call an unpaid Google translate API that worked well, but Google limits the amount of results it will provide when using an unpaid API. I created a Google account, set up the API, and received an API key to use, but I am having trouble with the syntax needed to implement the key.
There is some additional code to make this work, but I have included the critical sections (and where I believe my problem originates) below.

Note: I left off the first part of the link because I have not posted on this forum previously, and as such am not permitted to post links. I have replaced the first part of each link with "URL stuff" so that the important part of the URL can be viewed without actually linking a web page.

Code that uses unpaid API and works on a very limited basis:

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Code attempting to include the API key :

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I can post additional parts of the code if that would be helpful, but this section seemed to be the most pertinent. Thanks in advance for any help.