How to use the @azure/arm-apimanagement.ApiManagementClient function in @azure/arm-apimanagement

private async deployOperation(resource: ApiManagementServiceResource, api: ApiContract, backend: BackendContract, operation: OperationContract, functionName: string): Promise {
    try {
      const client = new ApiManagementClient(this.credentials, this.subscriptionId);

      const operationConfig: OperationContract = {
        name: operation.name || functionName,
        displayName: operation.displayName || functionName,
        description: operation.description || "",
        method: operation.method,
        urlTemplate: operation.urlTemplate,
        templateParameters: operation.templateParameters || [],
        responses: operation.responses || [],
      };

      // Ensure a single path seperator in the operation path
      const operationPath = `/${api.path}/${operationConfig.urlTemplate}`.replace(/\/+/g, "/");
      const operationUrl = `${resource.gatewayUrl}${operationPath}`;
      this.log(`--> ${operationConfig.name}: [${operationConfig.method.toUpperCase()}] ${operationUrl}`);

constructor(clientId, clientSecret, tenantId, subscriptionId) {

        this.clientId = clientId;
        this.clientSecret = clientSecret;
        this.tenantId = tenantId;
        this.subscriptionId = subscriptionId;

        this.classList = new Map();
        this.classList.set('WebSiteManagementClient', WebSiteManagementClient);
        this.classList.set('ResourceManagementClient', ResourceManagementClient);
        this.classList.set('StorageManagementClient', StorageManagementClient);
        this.classList.set('ApiManagementClient', ApiManagementClient);
        this.classList.set('CdnManagementClient', CdnManagementClient);
        this.classList.set('CosmosDBManagementClient', CosmosDBManagementClient);
        this.classList.set('EventHubManagementClient', EventHubManagementClient);
        this.classList.set('ServiceBusManagementClient', ServiceBusManagementClient);

        this.instanceList = new Map();
    }

public async Execute(): Promise {
        try {
            this._logger.log(`API Manamgement: Base Logging - ${this._ingredient.properties.source}`)
            let aiClient = new ApplicationInsightsManagementClient(this._ctx.AuthToken, this._ctx.Environment.authentication.subscriptionId);
            let client = new ApiManagementClient(this._ctx.AuthToken, this._ctx.Environment.authentication.subscriptionId)
            let util = IngredientManager.getIngredientFunction("coreutils", this._ctx)
            const helper = new ARMHelper(this._ctx);
            let params = await helper.BakeParamsToARMParamsAsync(this._name, this._ingredient.properties.parameters)
            let serviceName = params["apiManagementServiceName"].value
            //Import deployment parameters
            let properties = params["properties"]
            delete params["properties"]
            let loggerProps = params["logger"]
            delete params["logger"]
            
            params = await helper.ConfigureDiagnostics(params);
            //Deploy primary ARM template
            await helper.DeployTemplate(this._name, ApimTemplate, params, await util.resource_group())
            //Deploy named Key/Value pairs
            if (properties) {
                let keys = Object.keys(properties.value)

};
    }

    if (!this.apimConfig.name) {
      this.apimConfig.name = ApimResource.getResourceName(this.config);
    }

    if (!this.apimConfig.apis) {
      this.apimConfig.apis = [];
    }

    if (!this.apimConfig.backends) {
      this.apimConfig.backends = [];
    }

    this.apimClient = new ApiManagementClient(this.credentials, this.subscriptionId);
    this.functionAppService = new FunctionAppService(serverless, options);
  }