Implement Alipay, QQ and Wechat pay in my Android app. Raw files exist. App functions today

App has been developed but missing following functions that needs to be implemented in APP. App exist and function today without payment functions - Payment function with Itunes - Payment function with Android platforms for Chinese market ( Myapp,360, Baidu, xiaomi) - Payment function with Wechat, Alipay and QQ - List the app on AppStore and get it through the approval process - List the App on Chinese Android platform and get it through the approval process App description - App makes search in the database - App shows pdf pages uploaded in database - App has free user and paid users App update need - Minor adjustment in the database to show correct order of the search result in the app - Fine tuning in deisgn/layout of app - Implement payment function in app with Wechat, Alipay and QQ - List the app on Itunes and Android app store (Myapp,360, Baidu, xiaomi). Get it published for user to download app - Get the app free/premium user payment function to work in the App - Connect the functions with database and other supporting systems Requirement - Android and iOS development knowledge - List app on Chinese market Android platform (Tencent, Baidu, 306) - Payment function with Itunes - Payment function with Android platforms - Payment function with Wechat, Alipay and QQ - List the app on AppStore - List the App on Chinese Android platform (Baidu. Tencent, - Get the app free/premium user payment function to work in the App Available files - All raw files exist for Android and iOS. Developer don’t start from scratch - Database exist and working. Interface created with a purchased structure. System to be managed - Android developer, Apple Developer, Database from Aliyun Developer are required to know the Chinese App market and can show that they have developed Android APP for Chinese market and implemented app with payment functions of Wechat, alipay and QQ etc. Payment through milestones. Established user of Freelancer and has good payment reccords