Complex sentence: If the consumer answered yes, then they would be enrolled in the reward program and their credit card data automatically transferred from the retailer to Webloyalty without the consumer actually entering it again (a practice known as "data pass").
Split into simpler sentences: If the consumer answered yes, then their credit card data would be automatically transferred from the retailer to Webloyalty without the consumer actually entering it again. They would automatically be enrolled in the "reward" program that had been offered without giving their credit card information again (a practice known as "data pass").