public override Task <ProcessInstanceWithVariables> StartProcessInstance(StartProcessInstance parameters) => _api.StartProcessInstanceByKeyAndTenantId(_processDefinitionKey, _tenantId, parameters);
 public override Task <ProcessInstanceWithVariables> StartProcessInstance(StartProcessInstance parameters) => _api.StartProcessInstanceById(_processDefinitionId, parameters);
 /// <summary>
 /// Instantiates a given process definition. Process variables and business key may be supplied in the request body.
 /// </summary>
 public abstract Task <ProcessInstanceWithVariables> StartProcessInstance(StartProcessInstance parameters);