Changes to List Credits Packs

the response optional property results/items/currency_code became read-only for the status 200

the response optional property results/items/name became read-only for the status 200

the response optional property results/items/pack_amount became read-only for the status 200

the response optional property results/items/price became read-only for the status 200

the response property results/items/currency_code became required for the status 200

the response property results/items/name became required for the status 200

the response property results/items/pack_amount became required for the status 200

the response property results/items/price became required for the status 200

the response required property results/items/discount became read-only for the status 200

the response required property results/items/savings became read-only for the status 200