Implement in-app purchase on existing android app

it says you already purchased or what error, you have to check bought items,.....................................

Dear sir. Nice to meet you. I have read your job post in carefully and understood everything what you want. I have developed 30+ apps and Web Site & published them app stores in successfully for 5+ years. As you have seen, I have developed the various social networking apps & awesome games, so have the more experience than other bidders. As a typical apps, I have developed the taxi booking app, chatting and dating app, shopping cart app and game development etc. Thus can provide the awesome app with high quality & customization according to your requirements on time, on budget. Please check my apps in here & give me the feedback kindly. I'd like to work for the project with you together. I think we can work long term relationship further. I look forward to hearing from you soon. Please feel free to contact with at anytime. Thanks for looking my proposal. ITWhiz4U

Hello. I have read your project description but I need to ask few questions. I can not find any image attached. Please feel free to ping me anytime so we can have a detailed discussion.

A proposal has not yet been provided

Hello I was just going through your job posting and I believe that I have the drive, energy and knowledge to be perfect for this job. My experience as a Developer includes working with mobile applications by integrating them with different platforms using an assortment of protocols makes me perfect for your job. I have in the past work for many an app development project which required extensive detailing. And, you can have a look at my portfolio to know more. I hope you would choose me for this job, looking at my expertise, and my assurance to get the job within budget and on time. I welcome the opportunity to further discuss how I can apply my strengths to the progress. I appreciate your taking the time to review my credentials and experience. Thanks

Hi, I am an android developer and I understand the cause of the "Item Already Owned" message you get, hence can fix it. I have done same for an app and i will be readily available to fix yours too.

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although im new to freelancer i'm already experienced with 2 apps using in-app by google play can retrieve purchases/inventory from google with ease