Hello,
I'm an experienced PHP developer that had written multiple scripts to interacts with different APIs. Some examples of these include CloudFlare, Paypal, Google Maps, and WordPress. All of which were delivered here on FreeLancer, in which you could check the rating & feedback given for them.
I'm very interested in knowing what you would like to achieve with BetFair's API. I've already gone through its documentation, and could work with it without any issues.
We could chat to discuss further.
Regards,
Amr