Over the past several years, I have been doing internal projects for our companies, integrating WordPress with external APIs, including those for Salesforce.com, Intuit Quickbooks, SendGrid, Stripe, Dwolla, and others.
If you have WordPress integration requirements, I can help you with your development needs. Feel free to send me an email at ryan@ryanjhale.com. We can discuss your needs, and I can write a formal proposal for your specific situation.