public virtual Task <IExternalAccount> CreateAsync(string accountId, ExternalAccountCreateOptions options, RequestOptions requestOptions = null, CancellationToken cancellationToken = default)
 {
     return(this.CreateNestedEntityAsync(accountId, options, requestOptions, cancellationToken));
 }
 public virtual IExternalAccount Create(string accountId, ExternalAccountCreateOptions options, RequestOptions requestOptions = null)
 {
     return(this.CreateNestedEntity(accountId, options, requestOptions));
 }