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I have a Facebook app with server side on java. I created test callback using HttpRequestHandler. The problem is when I'm getting payments_get_items, Facebook do not accept Json I've sent, and gives this error:
"Sorry, but we're having trouble processing your payment. You have not been charged for this transaction. Please try again." Here is Json I'm sending:

Integer goldNum = o.get("item_id").getAsInt();
Integer creditsNum = building.getBuy().get(goldNum);

item.addProperty("title", "Buy gold");
item.addProperty("price", creditsNum);
item.addProperty("description", "Buy " + goldNum + " gold!");

JsonObject returnData = new JsonObject(); 
returnData.add("content", item);
returnData.addProperty("method", method);

response.getWriter().write(returnData.toString());
response.getWriter().close();
    return;

Here is what says log, when I'm logging returnData: {"content":{"title":"Buy gold","price":50,"description":"Buy 65 gold!"},"method":"payments_get_items"}. What am I doing wrong?
Is there a way to get more detailed explanation from Facebook?

Mikhail
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1 Answers1

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Try setting the content type to application/json:

response.setContentType("application/json");
response.getWriter().write(returnData.toString());
response.getWriter().close();
Kevin Bowersox
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