BUG / Conflict Coupon Code plugins break purchasing Membership Product

[kimwhite]

When activating a Coupon Plugin for WooCommerce (we have tested 3, Conditional Discounts for WooCommerce by ORION, Smart Coupons For WooCommerce Coupons, and WooCommerce Smart Coupons an error message appears when you place a PMPro Membership Level Production in the cart then view the cart (see image). Nothing is configured, and no coupon is used; simply the act of the coupon plugin being activated causes this error to appear.
"'Your Product Name' has been removed from your cart because it can no longer be purchased. Please contact us if you need assistance."

*if you put a regular product in THEN a membership it works.

https://capture.dropbox.com/DgKcjZuS1QgnXnYK

[andrewlimaza]

The issue looks like these coupon plugins are loading things on hooks that we rely on and it's creating false positives. We are investigating this.

For now you can silence this false/positive by using the following function:

function my_disable_pmpro_woo_is_purchasable() {
    remove_filter( 'woocommerce_is_purchasable', 'pmprowoo_is_purchasable', 10, 2 );
}
add_action( 'init', 'my_disable_pmpro_woo_is_purchasable' );

[andrewlimaza]

Upon further inspection these plugins are doing something to the is_purchasable and loading it multiple times on the checkout which is making the woocommerce_is_purchasable running more than once which is triggering a false on checkout.

I think the plugins in question should try to resolve this issue as it's out of our control and would be quite 'hacky' for us to figure things out. I am going to leave this open so we can circle back to this once we get a chance but I recommend disabling this notification and functionality as per the code snippet above.