curl_get_formidable_form.php

<?php
function _wgt_scripts() {
 // styles and scripts code...

	$form_html = array(
		'trip_signup_form'  => _wgt_get_trip_signup_form_html(),
		'request_trip_quote'  => _wgt_request_trip_quote_form_html()
	);

	wp_localize_script(
		'wgt-app',
		'wgtApi',
		array(
			//bunch of code added to rest..
			'form_html' 			=> $form_html
		)
	);

}
add_action( 'wp_enqueue_scripts', '_wgt_scripts' );

function _wgt_get_trip_signup_form_html() {
	$trip_signup_form_endpoint = esc_url_raw( get_rest_url() ) . 'frm/v2/forms/13?return=html';
	$curl = curl_init( $trip_signup_form_endpoint );
	curl_setopt( $curl, CURLOPT_RETURNTRANSFER, 1 );
	curl_setopt( $curl, CURLOPT_SSL_VERIFYHOST, 0 );
	curl_setopt( $curl, CURLOPT_SSL_VERIFYPEER, 0 );
	$trip_signup_form_response = curl_exec( $curl );
	curl_close( $curl );
	$trip_signup_form = json_decode( $trip_signup_form_response, true );
	return $trip_signup_form;
}

function _wgt_request_trip_quote_form_html() {
	$request_trip_quote_form_endpoint = esc_url_raw( get_rest_url() ) . 'frm/v2/forms/11?return=html';
	$curl = curl_init( $request_trip_quote_form_endpoint );
	curl_setopt( $curl, CURLOPT_RETURNTRANSFER, 1 );
	curl_setopt( $curl, CURLOPT_SSL_VERIFYHOST, 0 );
	curl_setopt( $curl, CURLOPT_SSL_VERIFYPEER, 0 );
	$request_trip_quote_form_response = curl_exec( $curl );
	curl_close( $curl );
	$request_trip_quote_form = json_decode( $request_trip_quote_form_response, true );
	return $request_trip_quote_form;
}