Changes to Subscribe account to subscritpion plan

response property detail/items/loc/items/ list-of-types was widened by adding types integer to media type application/json of response 422

the type response's property default value changed from PayLink to app__server__rest__subscriptions__dto__PayLink for the status 200

the allOf[subschema #2]/type response's property pattern was changed from ^PayLink$ to ^app__server__rest__subscriptions__dto__PayLink$ for the status 200

endpoint added