Auto Discount don’t apply after Woocommerce 3.0.1

Can you please paste your System Status Report?

### WordPress Environment ###

Home URL: https://store.pmfias.com
Site URL: https://store.pmfias.com
WC Version: 3.0.1
Log Directory Writable: ?
WP Version: 4.7.3
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: –
WP Cron: ?
Language: en_US

### Server Environment ###

Server Info: Apache/2.4.10 (Debian)
PHP Version: 7.0.17-1~dotdeb+8.1
PHP Post Max Size: 10 MB
PHP Time Limit: 60
PHP Max Input Vars: 2500
cURL Version: 7.38.0
OpenSSL/1.0.1t

SUHOSIN Installed: –
MySQL Version: 5.6.35
Max Upload Size: 10 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 3.0.1
WC Database Prefix: wp_
woocommerce_sessions: ?
woocommerce_api_keys: ?
woocommerce_attribute_taxonomies: ?
woocommerce_downloadable_product_permissions: ?
woocommerce_order_items: ?
woocommerce_order_itemmeta: ?
woocommerce_tax_rates: ?
woocommerce_tax_rate_locations: ?
woocommerce_shipping_zones: ?
woocommerce_shipping_zone_locations: ?
woocommerce_shipping_zone_methods: ?
woocommerce_payment_tokens: ?
woocommerce_payment_tokenmeta: ?
MaxMind GeoIP Database: ?

### Security ###

Secure connection (HTTPS): ?
Hide errors from visitors: ?

### Active Plugins (23) ###

Shield Security: by iControlWP – 5.8.1
Contact Form 7: by Takayuki Miyoshi – 4.7
Genesis Simple Hooks: by Nathan Rice – 2.2.0
Max Mega Menu - Pro Addon: by Tom Hemsley – 1.6.2.1
Max Mega Menu: by Tom Hemsley – 2.3.5
Pro Woo Quick View: by Arshid – 1.0.0
Redirection: by John Godley – 2.5
Responsive Accordion And Collapse: by wpshopmart – 1.8.9
Social Login Lite For WooCommerce: by phoeniixx – 1.4.5
SOFT79 Cart Links for WooCommerce: by Jos Koenis – 1.0.1
TinyMCE Advanced: by Andrew Ozz – 4.4.3
UpdraftPlus - Backup/Restore: by UpdraftPlus.Com
DavidAnderson – 1.12.40

WooCommerce - Instamojo: by instamojo – 1.0.6
WooCommerce Amazon S3 Storage: by WooThemes – 2.1.3 – 2.1.4 is available
WooCommerce Extended Coupon Features: by Soft79 – 2.4.0
Woocommerce Login / Signup  Pro: by phoeniixx – 2.1.5
WooCommerce Sequential Order Numbers: by SkyVerge – 1.8.1
WooCommerce: by Automattic – 3.0.1
Yoast SEO: by Team Yoast – 4.5
WP Force SSL: by Kostas Vrouvas – 1.3
WP-Mail-SMTP: by Callum Macdonald – 0.10.1
WP-Optimize: by David Anderson
Ruhani Rabin
Team Updraft – 2.1.1

WP Rocket: by WP Rocket – 2.6.13

### Settings ###

API Enabled: ?
Force SSL: ?
Currency: INR (?)
Currency Position: left
Thousand Separator: ,
Decimal Separator: .
Number of Decimals: 0
Taxonomies: Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

### WC Pages ###

Shop base: #4 - /
Cart: #6 - /checkout
Checkout: #6 - /checkout
My account: #111 - /my-account

### Theme ###

Name: Magazine Pro Theme
Version: 3.1
Author URL: https://www.studiopress.com/
Child Theme: ?
Parent Theme Name: Genesis
Parent Theme Version: 2.4.2
Parent Theme Author URL: https://www.studiopress.com/
WooCommerce Support: ? Not declared

### Templates ###

Overrides: –

Could you please try with a default theme like Storefront or twenty something?

Are you using a snippet to hide the “Apply coupon” field on the cart page, by any chance?

Please also try with WP Rocket disabled.

I was using this particular snippet to Hide Coupon fields

function hide_coupon_field( $enabled ) {
    if ( is_cart() || is_checkout() ) {
        $enabled = false;
    }
    
    return $enabled;
}
add_filter( 'woocommerce_coupons_enabled', 'hide_coupon_field' );

Above code caused the issue after WC 3.0.1 Update.

Thanks Soft79 for the clue.

Yes, I’ve seen that snippet a couple of times. Better remove the field from the template file.

Thanks for the feedback.