Usually, the plaintiff will present exhibits in chronological order, including any copies of «demand letters» (with certified mail receipt) written to the defendant. (peoples-law.org)
Service by mail is complete upon the return of the registered mail receipt personally signed by the financial institution or other evidence of service satisfactory to the court. (pacode.com)
The court clerk can advise you which form you must complete and attach to the international mail receipt. (info.legalzoom.com)