Service of notice: prescribed delivery methods include personal delivery, post, email, portal, publication or affixture; deemed served on tendering. Section 169 prescribes methods for service of notice under the Nagaland GST Act, including personal delivery to the addressee or authorised representative, registered post/speed post/courier with acknowledgement, sending to the registered e mail address, making the communication available on the common portal, publication in a local newspaper, or affixation at the last known place of business or residence (or on the issuing office's notice board if other modes are impracticable). It further provides that communications are deemed served on the date they are tendered, published or affixed, and that registered post/speed post are deemed received at the end of normal transit unless disproved.