API to configure the script on the landing page with order form for postback

Good day!

You need to make a script on the landing page, what would the order form to pass the data (name,phone number) via the API.

Need applications keep to his base, then stamped it postbac.

An example of the script is, detailed api documentation, too.

You will have many to do similar tasks, I would like to find a programmer who can on a permanent basis to apply for it.

1. Write the answer worked with API before.

2. The cost and time of execution.

Thank you for your attention and answers!