Unless the articles or regulations prohibit the authorization or taking of any action of the members or of the directors without a meeting, any action which may be authorized or taken at a meeting of the members or the directors may be authorized or taken by the respective body without a meeting with the affirmative vote or approval of, and in a writing or writings signed by all of the directors or two-thirds of the voting members, who would be entitled to notice of meeting for such purpose or in the case of members, such other proportion or number of voting members, not less than a majority, as the articles or regulations require. Any such writing shall be filed with or entered upon the records of the credit union. Any certificate with respect to the authorization or taking of any such action, which is required to be filed in the office of the superintendent of credit unions or the secretary of state, shall recite that the authorization or taking of such action was in a writing or writings approved and signed as specified in this section.