SFDC REST API From Formyoula

// Call Salesforce
call_duplicate_check_salesforce_apex_rest_api({
  data: { 
		"req": {
	    "first_name": "",
	    "last_name": "",
			"email": "",
	    "company": { "name": "" },
	    "address": { "street": "", "post_code": "", "state": "", "country": "" }
	  }
	},
  callback: function(error, response) {
    // Get agency details
    var duplicates = JSON.parse(response);
    // Log results
    console.log(duplicates);
  }
});

function call_duplicate_check_salesforce_apex_rest_api(options) {
  // Call Salesforce APEX REST
  window.formyoula.sfdc.apexrest(
    // Path
    '/Formyoula_Duplicate_Check_API/',
    // Callback
    function(response) {
      // Return Callback 
      return options.callback(null, response);
    },
    // Error
    function(error) {
      // Return Callback 
      return options.callback(error, null);
    },
    // Method
    'POST',
    // Payload
    JSON.stringify(options.data),
    // ParamMap
    null,
    // Retry
    false
  );// END apexrest
}// END call_salesforce_apex

@RestResource(urlMapping='/Formyoula_Duplicate_Check_API/*')
global with sharing class Formyoula_Duplicate_Check_API {
  
  // Post request to find agency details based on search parameters
  @HttpPost
  global static String doPost( Request_JSON req ) {
    // Call Duty Holder duplicate check
    List<Contact> duplicate_records = Formyoula_Duplicate_Check.Get_Duplicate_Records(JSON.serialize(req));
    // Return records
    return JSON.serialize(duplicate_records);
  }// END doPost
  
  global class Request_JSON {
    global String first_name;
    global String last_name;
    global String email;
    global Company company;
    global Address address;
  }
  
  global class Company {
    global String name;
  }
  
  global class Address {
    global String street;
    global String post_code;
    global String state;
    global String country;
  }
  
}