巴西人来华商务签证，邀请函怎么办理

我们是一家外企服务公司，为外国企业、在华代表处、外商金融机构及经济组织提供专业的、多元化的服
  务。集外国人签证、外国企业服务、人力资源、物流、翻译相关的服务于一体。
  专业办理外国人工作签证延期 变更就业证 Transact extension for work visa for foreign people
  外籍人士旅游签证L商务签证F延期;
  Transact extension for tourist visa L and business visa F for foreign people;
  外籍人士旅游签证L转商务签证F;
  Transmute tourist visa L to business visa F for foreign people;
  外籍人士商务邀请函，工作邀请函;
  Make business invitation and work invitation for foreign people;
  外籍人士就业许可、就业证、工作签证 新办\延期\变更;
  Make/ extend/ alter work visa; employment permit; work certificate for foreign nationals
  外籍人士家属签证（居留许可）新办\延期;
  Make/ extend residence permit for the family members of foreign nationals;
  外籍人士学生签证延期;
  Extend student visa for foreign nationals
  外籍人士在华的工作签证（1-2年）;
  Transact work visa for foreign people in China (valid time: 1~2 years)
  外籍人士专家证书;
  Translate several kinds of certificates and documents for foreign experts
  外籍人士国际驾照换中国驾照;
  Transmute international driving permit to Chinese driving permit

Name ：Anna(付小姐)
Cell : 18721831812
Tel ：021-60549484
Email: anna_visa@16***
MSN ：anna18721831812@liv***
Q Q   : 1253159617