How to add plugin custom field to custom post type?

I have used a plugin called Amazon product in a post. It works okay with posts type. It adds custom fields in the posts page. But, I have made another custom post type called products. It does not work with that. I want the custom field appear in Products post type.

I have used few suggestions.
Adding plugin in custom posts type but it did not work for me.

I have googled, tried several plugins but none of these seems to work. Can anyone suggest me another plugin or any other way to solve my purpose. What I want to do is, add amazon selected books to my website, in my custom post type pages. I have tried adding

if(function_exists('amazonProductInAPostBox1')){
    global $appipBulidBox;
    $custom_post_type="put-post-type-here";
    add_action('admin_menu', create_function("$appipBulidBox",
"if( function_exists( 'add_meta_box' ))add_meta_box( 'amazonProductInAPostBox1',
__( 'Amazon Product In a Post Settings', 'appplugin' ), 'amazonProductInAPostBox1', $custom_post_type, 'normal', 'high' );"));
}

But It did not seem to work.
Thanks in advance

Suresh
what is the custom post type you want to hook into?
You need to make sure you change the $custom_post_type=”put-post-type-here”; line to be the actual custom post type slug you want to hook it into. Then, I would suggest adding the function to the functions.php.
And try it this way:

add_action('admin_menu','new_appip_custom_post_type_metabox');
function new_appip_custom_post_type_metabox(){
     if(function_exists('amazonProductInAPostBox1') && function_exists( 'add_meta_box')){
         add_meta_box( 'amazonProductInAPostBox1','Amazon Product In a Post Settings', 'amazonProductInAPostBox1', 'put-post-type-here', 'normal', 'high' );
     }
     return;
}