Add styles to wp-admin

admin_enqueue_scripts admin_head

use the admin_head hook

add_action('admin_head', 'my_admin_style');
function my_custom_fonts() {
?>
<style>
tr[data-gateway_id^="stripe_"] {
    display: none;
}
</style>
<?php
}

or, you can use the admin_enqueue_scripts hook

add_action('admin_enqueue_scripts', 'my_admin_stylesheet');
function my_admin_stylesheet() {
    // enqueue your stylesheet
    wp_enqueue_script( 'my_custom_script', plugin_dir_url( __FILE__ ) . 'myscript.js', array(), '1.0' );
}