github.com/gotd/td/tg.InputInvoicePremiumAuthCode.GetPurpose (method, view implemented interface methods)

one use

	github.com/gotd/td/tg (current package)
		tl_input_invoice_gen.go#L2488: func (i *InputInvoicePremiumAuthCode) GetPurpose() (value InputStorePaymentPurposeClass) {