Implementation

Implementation Procedure

  1. The user initiates WeChat payment in the WeChat mini app
  2. The WeChat mini app calls the OTT Pay API for payment, and the OTT Pay server returns Payment Parameters
  3. The WeChat mini app uses the returned payment parameter to call the WeChat wallet for payment

Code Example

Get Payment Parameters：

Map<String, Object> data = new HashMap<>();
data.put("appId", "wx7f194c1f7aad1643");
data.put("openId", "owv3d1fnMq0IpB6vWL7pK3TmJhBw");
data.put("amount", "100");
data.put("callbackURL", "https://your.callback.url");
data.put("remark", "this is remark");

Gson gson = new Gson();
RequestBody body = RequestBody.create(gson.toJson(data), MediaType.parse("application/json; charset=utf-8"));
String token = "eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJPTjAwMDAwMTY2MTM5IiwiYXVkaWVuY2UiOm51bGwsInJvbGUiOm51bGwsImNyZWF0ZWQiOjE2Nzg0NzY3NDg5NTIsInVzZXJ0eXBlIjoiQ1VTVE9NRVIiLCJleHAiOjE2Nzg0Nzc2NDgsInVzZXJpZCI6MTM5fQ.CRO7ilMO9-1Rpr72lhr6wTmi9fMgGC-foAMLOR8sZD8f1fjOhcRHe625ubVZgGrNlxxD2nLUDQ-1cU8rzwDKhg";
Request request = new Request.Builder()
    .url("https://ecom-api.ottpay.com/api/v1/pay/weixin/mapp-pay")
    .addHeader("Authorization", "Bearer " + token)
    .post(body)
    .build();

final OkHttpClient httpClient = new OkHttpClient();
try (Response response = httpClient.newCall(request).execute()) {
    if (!response.isSuccessful()) {
        System.out.println(response.body().string());
        throw new IOException("Unexpected code " + response);
    }

    // Get response body
    System.out.println(response.body().string());
} catch (IOException e) {
    throw new RuntimeException(e);
}

The WeChat mini app page calls the built-in object of the WeChat page to make payment according to the payment parameters:

wx.requestPayment({
    appId: appId,
    timeStamp: timeStamp,
    nonceStr: nonceStr,
    package: packageStr,
    signType: signType,
    paySign: paySign,
    success: function (res) {
        // payment successful
        // ...
    },
    fail: function (err) {
        // payment failed
        // ...
    },
    complete: function (res) {
        // payment completed
        // ...
    }
});