在网上申请巴基斯坦商务签，签证材料什么都已经准备妥当，但是$

请问电子商务签所需要的材料
3.Proof of registration of company which is extending invitation (SECP/ Chamber of Commerce Certificate)
4.Invitation letter from business organization duly recommended by concerned trade organization in Pakistan
是指邀请函和开具邀请函的公司的营业执照吗？需要经过商会或其它机构认证吗？