woocommerce_email_subject_customer_invoice

apply_filters('woocommerce_email_subject_customer_invoice') is found 1 times:

• /includes/emails/class-wc-email-customer-invoice.php line 91

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  return apply_filters( 'woocommerce_email_subject_customer_invoice_paid', $this->format_string( $subject ), $this->object, $this );     }       $subject = $this->get_option( 'subject', $this->get_default_subject() );     return apply_filters( 'woocommerce_email_subject_customer_invoice', $this->format_string( $subject ), $this->object, $this ); }   /**  * Get email heading.  *  * @return string

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