Limit downloads on EDD

nag-and-prevent-checkout.php

<?php 
// Add this to the functions.php file on your child theme

/** Limit download purchases to one per account
  * HT to Scott Deluzio for original code this is modified from https://scottdeluzio.com/easy-digital-downloads-limit-one-per-customer/

// Give nag message if customer has bought download previously
add_filter( 'edd_can_checkout', 'sd_set_purchase_limit' );

function sd_set_purchase_limit(){
	$user_id 		= get_current_user_id(); // Get the current customer's ID
	$downloads 		= edd_get_users_purchased_products( $user_id ); // Get all of the products the customer has purchased in the past
	$can_checkout 		= true; // Allow checkout for now
	$in_cart 		= edd_item_in_cart( '57' ); // Check to see if our download is in the customer's cart. Change 57 to your download's ID.
	$download_name    	= get_the_title( '57' ); // Get the name of the download. Change 57 to your download's ID.

	if ( $in_cart == true ){ // If the item isn't in the customer's cart we don't need to go any further.
		if ( ! empty( $downloads ) ){ // If the customer hasn't purchased anything before we don't need to go any further.
			foreach ( $downloads as $download ){ // Loop through each product the customer has purchased before.
				switch ( $download->ID ) {
					case '57': // If the customer has purchased the product we want to limit one per customer set an error message. Again change 57 to your product's ID. Update URL in nag message
						$can_checkout = false;
						edd_set_error( 'already_purchased', apply_filters( 'edd_pc_error_message', __( 'You have already purchased "'. $download_name . '". To download the file again visit <a href="#">your dashboard</a>. If there are other items in your cart you would like to purchase, remove "'. $download_name . '" to continue.' ) ) );
						break;

					default:
						$can_checkout = true;
						edd_unset_error( 'already_purchased' );
						break;
				}
			}

			edd_print_errors(); // Display the errors on the checkout page.
		}
	}
	return $can_checkout
}

hmmm spoke too soon. This is preventing all checkout. Debugging.

ok solved it!

1. didn't include the return $can_checkout at the end of code (my oversight)
2. $can_checkout needs to come before error setting
3. removed the add_action because it was producing duplicate errors.

Hi @adriannees,

I got here from scottdeluzio.com post about this.

I was wondering if you know how to make this code to check all the downloads on a specific category, so every time I add a download to that category I don't have to edit the code with new ID's?

Thanks
All the best.