Changes to Account Checkout

removed the enum value basic of the request property plan

removed the enum value pro of the request property plan

removed the enum value realtime of the request property plan

added the new basic_2026 enum value to the request property plan

added the new plus_2026 enum value to the request property plan

added the new pro_2026 enum value to the request property plan

request property plan was restricted to a list of enum values

added the new basic enum value to the request property plan

added the new pro enum value to the request property plan

added the new realtime enum value to the request property plan

removed the pattern ^(basic|pro|realtime|basic_2026|plus_2026|pro_2026)$ from the request property plan

changed the pattern of the request property plan from ^(basic|pro|realtime)$ to ^(basic|pro|realtime|basic_2026|plus_2026|pro_2026)$

changed the pattern of the request property plan from ^(basic|pro)$ to ^(basic|pro|realtime)$

endpoint added