This sentence is loosely worded. Plaid's lawyers may have approved it, but did the lawyers of the company systems that were accessed approve it?
I cannot imagine the company's I've worked for allowing a non-partner 3rd party to pay me, an individual, for access to company systems, let alone approving it even if I wasn't getting paid...
Additionally, as a Senior Manager in my org, I could not accept a payment like this as it's a conflict of interest. It's even more egregious if plaid "got approval from a higher up for $500"