Seriously... Can anyone see why my do_settings_sections fails to print? I'm blind, appearantly. *scratches head* #wordpress #do_settings_sections

pinboard-hearts-wp.php

<?php
define( 'MENU_SLUG', 'pinboard-hearts-wp' );

add_action( 'admin_menu', 'pinbheartswp_admin_menu', 10 );
function pinbheartswp_admin_menu() {
    /*    
    add_options_page( $page_title, $menu_title, $capability, $menu_slug, $function);
     */
    add_options_page( __('Pinboard &hearts; WordPress Options', 'pinbheartswp' ), __('Pinboard &hearts; WP', 'pinbheartswp' ), 'manage_options', MENU_SLUG, 'pinboard_hearts_wordpress_options' );
}

add_action( 'admin_init', 'pinbheartswp_admin_init' );
function pinbheartswp_admin_init() {
  
  /* 
     * http://codex.wordpress.org/Function_Reference/register_setting
     * register_setting( $option_group, $option_name, $sanitize_callback );
     * The second argument ($option_name) is the option name. It’s the one we use with functions like get_option() and update_option()
     * */
    # With input validation:
    # register_setting( 'my-settings-group', 'pinbheartswp-settings', 'pinbheartswp_settings_validate_and_sanitize' );    
    register_setting( 'pinbheartswp-settings-group', 'pinbheartswp-settings' );
    
    /* 
     * http://codex.wordpress.org/Function_Reference/add_settings_section
     * add_settings_section( $id, $title, $callback, $page ); 
     * */    
    add_settings_section( 'section-settings', __( 'Settings', 'pinbheartswp' ), 'section_settings_callback', MENU_SLUG );
    add_settings_section( 'section-links', __( 'Links', 'pinbheartswp' ), 'section_links_callback', MENU_SLUG );
    # add_settings_section( 'section-notes', __( 'Notes', 'pinbheartswp' ), 'section_notes_callback', MENU_SLUG );
    
    /* 
     * http://codex.wordpress.org/Function_Reference/add_settings_field
     * add_settings_field( $id, $title, $callback, $page, $section, $args );
     * */
}
/* 
 * THE ACTUAL PAGE 
 * */
function pinboard_hearts_wordpress_options() {
?>
  <div class="wrap">
      <h2><?php _e('Pinboard &hearts; WordPress Options', 'pinbheartswp'); ?></h2>
      <form action="options.php" method="POST">
        <?php settings_fields('pinbheartswp-settings-group'); ?>
        <?php do_settings_sections( MENU_SLUG ); ?>
        <?php submit_button(); ?>
      </form>
  </div>
<?php }
/*
* THE SECTIONS
* Hint: You can omit using add_settings_field() and instead
* directly put the input fields into the sections.
* */
function section_settings_callback() {

    $settings = (array) get_option( 'pinbheartswp-settings' );

    _e( 'Some help text regarding the section goes here.' );
    echo "<p>";
        $field = "pinboard_api_key";
        echo "<input type='text' name='pinbheartswp-settings[$field]' value='$value' />";
    echo "</p>";

}
function section_links_callback() {

    $settings = (array) get_option( 'pinbheartswp-settings' );

    _e( 'Some help text regarding the section goes here.' );
    echo "<p>";
        $field = "pinboard_api_key";
        echo "<input type='text' name='pinbheartswp-settings[$field]' value='$value' />";
    echo "</p>";
}

Fixed: https://gist.github.com/lolitaloco/4c681f99da54286221a2/revisions

I was sending settings field id into do_settings_sections instead of the page it belongs to (constant MENU_SLUG in my code).