github.com/gotd/td/tg.InputStorePaymentPurposeClassArray.Retain (method)

one use

	github.com/gotd/td/tg (current package)
		tl_input_store_payment_purpose_slices_gen.go#L57: func (s InputStorePaymentPurposeClassArray) Retain(keep func(x InputStorePaymentPurposeClass) bool) InputStorePaymentPurposeClassArray {