(a) No such proposed stock insurer, corporation, or syndicate shall issue any share of stock or participation agreement except for payment in cash or in securities eligible for investment of funds of insurers. No such shares or agreement shall be issued until all subscriptions received under the solicitation permit have been so fully paid, nor, if an insurer, until a certificate of authority has been issued to it.
(b) Every subscription contract to shares of a stock insurer or other corporation calling for payment in installments, together with all amounts paid thereon may be forfeited at the option of the corporation, upon failure to make good a delinquency in any installment upon not less than 45 days' notice in writing, and every such contract shall so provide.