woocommerce_email_heading_customer_invoice, $this->format_string( $heading

apply_filters('woocommerce_email_heading_customer_invoice, $this->format_string( $heading') is found 1 times:

• /includes/emails/class-wc-email-customer-invoice.php line 121

  				return apply_filters( 'woocommerce_email_heading_customer_invoice_paid', $this->format_string( $heading ), $this->object, $this );
  			}
  
  			$heading = $this->get_option( 'heading', $this->get_default_heading() );
  			return apply_filters( 'woocommerce_email_heading_customer_invoice', $this->format_string( $heading ), $this->object, $this );
  		}
  
  		/**
  		 * Default content to show below main email content.
  		 *
  		 * @since 3.7.0
  

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