Changes to Swap line

the data response's property type changed from no type to object for status 200

removed the request property customDiscount

removed the request property pricingType

api operation id swap-line-on-subscription removed and replaced with swap-line

added the new optional request property cancellationFlowId

for the path request parameter lineId, the format was generalized from int32 to int64

for the path request parameter subscriptionId, the format was generalized from int32 to int64

added the non-success response with the status 400

added the optional property data/id to the response with the 200 status

added the optional property data/name to the response with the 200 status

added the optional property data/price to the response with the 200 status

added the optional property data/quantity to the response with the 200 status

added the optional property data/shopifyId to the response with the 200 status

added the optional property pageInfo to the response with the 200 status