WordPress Custom post type require my file

I am building a plugin that will create a bunch of custom types of posts. The plugin will connect with an external API for different functions. For that, the settings page requires the API login form. All I want is in the admin area, when they will click the custom types pages to be required by the same api login form. Where should I place the expression

<?php require('api_login.php'); ?>

for the custom type pages? Is there a way to make it in the functions? Please be aware that the plugin will be given away and I will have no control on the other native files of WordPress platform.

Solutions

No. The expression must be in every file where I need to call the login. Found that later.

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