Adding a REST API validatation to Wordpress Contact Form 7 - wordpress

Question

I am fairly new to WP programming and not that skill with backend work.
A client recently asked to add an API to the current form they have on their website. We are using the Contact Form 7 plugin for submissions.
Below is the REST API they sent over to add to the form. I am unsure how to place the code to the form.
Any guidance is greatly appreciated.
Web Service Type: REST
Endpoint: https://api.anasight.com/emive
Method: POST
Encoding: application/json
API KEY must be passed in header named ‘x-api-key’
Concurrency limits: 500 requests / sec
Data Model:
{
"$schema": "http://json-schema.org/draft-07/schema#",
"title": "PersonLite",
"type": "object",
"required": [ "email","ip","regdttm","sourceurl","flex1" ],
"properties": {
"email": {
"type": "string",
"description": "The person's email address."
},
"ip": {
"type": "string",
"description": "The person's IP address captured at registration."
},
"regdttm": {
"type": "string",
"description": "The timestamp when the person registered to receive emails."
},
"sourceurl": {
"type": "string",
"description": "The url of the site that collected the registration."
},
"firstname": {
"type": "string",
"description": "The person's first name."
},
"lastname": {
"type": "string",
"description": "The person's last name."
},
"city": {
"type": "string",
"description": "The person's city."
},
"state": {
"type": "string",
"description": "The person's state."
},
"zip": {
"type": "string",
"description": "The person's ZIP code."
},
"listid": {
"type": "string",
"description": "The listid from the publisher."
},
"flex1": {
"type": "string",
"description": "Please send value of E for emive records and M for Myza records"
}
}
}
Sample CURL request:
curl --silent --show-error -H "Accept: application/json" -H "Content-Type: application/json" -H "x-api-key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" --data '{"firstname":"Joe","lastname":"Johnson","email":"joe#example.com","city":"Roswell","state":"NM","zip":"12345-6789","ip":"127.0.0.1","regdttm":"2021-05-11 14:25:00","sourceurl":"sendmegreatoffers.com"}' https://api.anasight.com/emive