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I'm not speaking for or against Zenefits and their methods, but ADPs API is severely limited and extremely expensive. I worked with their Dealer Services division when I was at a startup in the automotive space and ADP had one of the worst crafted APIs I have ever seen. I made a comment about it on an earlier Zenefits post, but the gist was that the "stable, production API" was a constantly moving target that changed without notice or reason.

I believe we had incurred over $50,000.00 in fees before we ever reached the testing stage or purchased the right to use the API (that license is on a client by client basis, too). That $50M number was fees directly to ADP, and does not include our own payroll and expenses.

We were completely bootstrapped and started with about $70M in the bank, yet we were still able to complete that integration. I can't see how a company with over $500MM in funding[0] couldn't unless they were prohibited by ADP.

https://www.crunchbase.com/organization/zenefits