Form Building + API Integration

Looking for a PHP developer who can create a basic form for me that interacts with this API - https://documenter.getpostman.com/view/4811107/SzS5wSad?version=latest#f7ef683e-f3c5-403e-a919-dad5ab11d369 - POSTCreate an Opportunity

I would like the form to validate the inputted data – with the following fields being populated:

“subject” – User entered text box
“show_starts_at” – Date / time picker I guess using jQuery
“show_ends_at” - Date / time picker I guess using jQuery
“ordered_at” – Current date and time, not selected by user
“description” – Large user entered text box
“owned_by” – Number hard coded, not selected by user

“custom_fields” – object with the following fields in it:
“event_website” – User enterable URL
“monster_contact_email” – user enterable Email – that must validate based on the domain.

Would like it so that the form checks that all information has been inputted and gives errors based on fields that are not filled in.

When the form is submitted to the API – would also like a copy of the details to be emailed to a specific email address.

In the same form – I’d also like to use this API - https://documenter.getpostman.com/view/4811107/SzS5wSad?version=latest#9541f9e9-c5fe-4eef-a66b-285de0293d8a to “Create a Member”.

The form would create a new member with the following:

name – user enterable input
membership_type – set to ‘Venue’
primary_address object with the following user input fields
name – text input
street – text input
postcode – text input
country – user dropdown input

Then once the new member is created and an ID is returned – it’s then used in the api that was originally discussed as “venue_id”.