API June 2025 improvements

• Added - Maximum values:
  • maximum_basket_total_value_earn: Maximum basket value allowed for campaigns to issue rewards during basket processing
  • maximum_basket_total_value_spend: Maximum basket value allowed for redeeming standalone vouchers in baskets
• Added - added opt_in_secondary_last_modified_date, which is a datetime field that records the last time opt_in_secondary date changed in User object.