Your monthly customer loyalty voucher is automatically generated based on the total of your order and is subject to change from month to month based on your spending habits. The system calculates your voucher based on the purchases you made within the 12 months that preceded the month in which the voucher was sent out.
For example, the July 2018 vouchers were based on all the purchases that were made from July 1, 2017 through June 31, 2018. For the August 2018 vouchers, the system looks at your purchases from August 1, 2017, until July 31, 2018. Wherever your spending falls in any given month is what determines the amount of your monthly voucher.
Please note that your final spending tier is calculated excluding taxes, returns and vouchers used.