I received an email from Costco about the $50 visa checkout promotion from March where if you spend $250 you got back $50. I bought Costco cards and received this email:
Thank you for your recent order with Costco.com.
We have been notified by Visa Checkout that your order did meet the eligibility requirements for the $50 statement credit. Due to the overwhelming response to this promotion, there has been a slight delay in processing the credits. We anticipate that you will be able to see your credit in your online statement no later than Thursday, May 31, 2018.