An order granting security for costs is appealable as it is a final order on the separate and ancillary issue of entitlement to security, collateral to the main dispute. Section 13 of the Companies Act 61 of 1973 affords a court discretion to order a company to provide security for costs only if certain jurisdictional facts are established. The defendant bears the onus of satisfying these requirements, specifically that there must appear by credible testimony to be reason to believe that the company will be unable to pay the defendant's costs if successful. Until these jurisdictional requirements have been satisfied, the court has no power to order security and the question of how to exercise discretion does not arise. A plaintiff company has no obligation to place information before the court as to its financial position until the defendant has first satisfied the jurisdictional requirements of section 13. The existence of a subrogation agreement between a company and its insurer does not constitute reason to believe the company will be unable to pay a defendant's costs, as subrogation is a matter between insurer and insured and does not affect the defendant's rights against the plaintiff. A bald statement of belief in a rule 47(1) notice, not confirmed under oath in the subsequent application, does not constitute 'credible testimony' within the meaning of section 13.