Invitation letter from china for tourism?

Dear China Travel Team,

Before I allways traveled with my wife,this time my wifes daughter will come with us.
The Daughter is living in Cuba.The chinese embassy there is asking for a Invitation letter from china.
What Iam refering is the point 6 of the Visa Aplication document.(6。原件或传真的邀请信件及复印件，包括以下类型：○邀请函或授权的机构签发的签证申请表。○文档的商业活动。○会议邀请。○交易会或其他类型的邀请函主办单位发出的邀请函)
We travel every year individually .the diference for this year is that we want to make our trip with the daughter.
Is your company able to help us in this question booking our hotels with you .is your company an authorized Agency to fulfill the issue(no.6) in order to receive the VISA for the daughter.

I forgot to say that my wife and me we live in Germany untill now we never need to fulfill this point no.6
last year for example we showed our flight tickets and our Ctrip reservations and we got our chinese VISA.

best greetings from grmany berlin city

greetings
your faithful customers