showing, as a general rule, his full name, his category and class, the consular district and the seat of the consular post. 2. The sending State shall transmit the commission or similar instrument through the diplomatic or other appropriate channel to the Government of the State in whose territory the head of a consular post is to exercise his functions. 3. If the receiving State agrees, the sending State may, instead of a commission or similar instrument, send to the receiving State a notification containing the particulars required by paragraph 1 of this article. Article 12 The exequatur 1. The head of a consular post is admitted to the exercise of his functions by an authorization from the receiving State termed an exequatur, whatever the form of this authorization. 2. A State which refused to grant an exequatur is not obliged to give to the sending State reasons for such refusal. 3. Subject to the provisions of articles 13 and 15, the head of a consular post shall not enter upon his duties until he has received an exequatur. Article 13 Provisional admission of heads of consular posts Pending delivery of the exequatur, the head of a consular post may be admitted on a provisional basis to the exercise of his functions. In that case, the provisions of the present Convention shall apply. Article 14 Notification to the authorities of the consular district As soon as the head of a consular post is admitted even provisionally to the exercise of his functions, the receiving State shall immediately notify the competent authorities of the consular district. It shall also ensure that the necessary measures are taken to enable the head of a consular post to carry out the duties of his office and to have the benefit of the provisions of the present Convention. Article 15 Temporary exercise of the functions of the head of a consular post 1. If the head of a consular post is unable to carry out his functions or the position of head of consular post is vacant, an acting head of post may act provisionally as head of the consular post. 2. The full name of the acting head of post shall be notified either by the diplomatic mission of the sending State or, if that State has no such mission in the receiving State, by the head of the consular 7