An application under rule 767 is to be –

(a) accompanied by an affidavit of the applicant or, in the case of a corporation, its proper officer, verifying the facts on which the application is based; and

(b) endorsed with a certificate of the counsel or practitioner who prepared it to the effect that in his or her opinion the application is a proper application under rule 767 ; and

(c) unless it is made by the Attorney-General, endorsed with a certificate of the applicant's practitioner that, to the best of the practitioner's knowledge and belief, the applicant is competent to pay all costs which may be incurred.