Changes to POST /offers/:offer_id/switches

added the new trial enum value to the type response property for the response status 201

added the new trial enum value to the request property type

added the new required request property to

added the new required request property type

the request's body type changed from no type to object

the response's body type changed from no type to object for status 201

added the new optional request property from

added the new optional request property preset

added the media type application/json for the response with the status 400

added the optional property from to the response with the 201 status

added the optional property preset to the response with the 201 status

added the required property to to the response with the 201 status

added the required property type to the response with the 201 status

endpoint added