Woocommerce with Autoship Powered by QPilot Dynamic Checkout Price

functions.php

<?php
/**
* Applies a custom checkout price to a speicific priduct with a frequency type and number
* otherwise returns original checkout price.
* @param float  $checkout_price.  The current discounted or not checkout price for this autoship product.
* @param int    $product_id.      The current product's id.
* @param string $frequency_type.  The Autoship frequency type ( Months, Days, etc ).
* @param int    $frequency.       The frequency value.
*
* @return float                   The new calculated checkout price or the originally supplied
*                                 vlaue.
*/
function xx_dynamic_autoship_checkout_price( $checkout_price, $product_id, $frequency_type, $frequency ){

  // Simple example checks for if this is a special product id.
  if ( 9 == $product_id ){

    $product = wc_get_product( $product_id );
    $original_price = $product->get_price();

    // Generate a switch key.
    $key = $frequency_type . '-' . $frequency;
    $discounts = array(
      'Months-3' => .1,
      'Months-4' => .25,
      'Months-5' => .4,
    );

    // Easy case just check if this is a discounted combo
    // If so return new calculated checkout price.
    // If not return original checkout price.
    if ( isset( $discounts[$key] ) ) {

      return (int)( ( $original_price - ($original_price * $discounts[$key]) ) * 100 ) / 100;

    } else {

      return $checkout_price;

    }

  }

  return $checkout_price;

}
add_filter( 'autoship_checkout_price', 'xx_dynamic_autoship_checkout_price', 10, 4 );