In app purchase 2 .verified error

Ionic Framework ionic-v3
1

Hi there. I am using ionic 3 and in app purchase 2@4. I use this code to approve

    this.store.when('product')
    .approved((p: IAPProduct) => {
      if (p.id === one_month_membership) {
        console.log();
      }
      else if (p.id === three_months_membership) {
        console.log();
      }
      else if (p.id === six_months_membership) {
        console.log();
      }
      else if (p.id === yearly_membership) {
        console.log();
      }
      this.ref.detectChanges();
      return p.verify();
    })
    .verified((p: IAPProduct) => p.finish());

but i get this error when i try to use .verifed

Property 'verified' does not exist on type 'void'.

any

i really wanna know am i doing something wrong or ionic in app purchase 2@4 doesn’t support .verifed

thanks and best regards.