Changes to Bulk update lines

the request property linesToAdd/items/quantity became required

the request property linesToAdd/items/variantShopifyId became required

the request property linesToRemove/items/lineId became required

the request property linesToUpdate/items/lineId became required

the request property linesToUpdate/items/quantity became required

removed the request property linesToAdd/items/discountType

removed the request property linesToAdd/items/discountValue

removed the request property linesToAdd/items/isOneTime

removed the request property linesToAdd/items/lineOrderInterval

removed the request property linesToAdd/items/nextOrderId

removed the request property linesToUpdate/items/customAttributes

added the new optional request property linesToUpdate/items/sellingPlanGroupId

removed the non-success response with the status 400