In such contracts there shall be a provision that the contract may be reinstated at any time within one year from the date of default in making stipulated payments to the insurer, unless the cash surrender value has been paid, but all overdue stipulated payments and any indebtedness to the insurer on the contract shall be paid or reinstated, with interest thereon at a rate to be specified in the contract but not exceeding six percent per annum payable annually, and in cases where applicable, the insurer may also include a requirement of evidence of insurability satisfactory to the insurer.