Insert Custom Post Types in REST API

index.php

<?php
// Plugin Name: Insert Custom Post Types in REST API

add_action( 'init', 'my_custom_post_type_rest_support', 25 );
  function my_custom_post_type_rest_support() {
  	global $wp_post_types;
  
  	//be sure to set this to the name of your post type!
  	$post_type_name = 'offers';
  	if( isset( $wp_post_types[ $post_type_name ] ) ) {
  		$wp_post_types[$post_type_name]->show_in_rest = true;
  		$wp_post_types[$post_type_name]->rest_base = $post_type_name;
  		$wp_post_types[$post_type_name]->rest_controller_class = 'WP_REST_Posts_Controller';
      }
      
      //be sure to set this to the name of your post type!
  	$post_type_name = 'branch';
  	if( isset( $wp_post_types[ $post_type_name ] ) ) {
  		$wp_post_types[$post_type_name]->show_in_rest = true;
  		$wp_post_types[$post_type_name]->rest_base = $post_type_name;
  		$wp_post_types[$post_type_name]->rest_controller_class = 'WP_REST_Posts_Controller';
  	}
  
  }


?>