FulfillmentService

class FulfillmentService {    constructor(connection: TransactionalConnection, fulfillmentStateMachine: FulfillmentStateMachine, eventBus: EventBus, configService: ConfigService, customFieldRelationService: CustomFieldRelationService)    create(ctx: RequestContext, orders: Order[], lines: OrderLineInput[], handler: ConfigurableOperationInput) => Promise<Fulfillment | InvalidFulfillmentHandlerError | CreateFulfillmentError>;    getFulfillmentLines(ctx: RequestContext, id: ID) => Promise<FulfillmentLine[]>;    getFulfillmentsLinesForOrderLine(ctx: RequestContext, orderLineId: ID, relations: RelationPaths<FulfillmentLine> = []) => Promise<FulfillmentLine[]>;    transitionToState(ctx: RequestContext, fulfillmentId: ID, state: FulfillmentState) => Promise<        | {              fulfillment: Fulfillment;              orders: Order[];              fromState: FulfillmentState;              toState: FulfillmentState;          }        | FulfillmentStateTransitionError    >;    getNextStates(fulfillment: Fulfillment) => readonly FulfillmentState[];}