Develop Reference

Integrating PayPal Checkout in an Android app

I am integrating Paypal checkout in an Android App using REST APIs provided by Paypal and my country is India so I am following this guide from PayPal.
How I did as per docs:
Get access-token (/v1/oauth2/token) for further api calls.
Use the Create Order API to create a payment (v2/checkout/orders)and in the response we will get approval url at where you need to redirect user to make the payment.
Now my question is how do I know if payment transaction was successful or not in mobile app because I am using WebView in my app to load approval url.
Order is created like this and I load href inside webview:
{
"id": "1KK44573EX7352015",
"status": "CREATED",
"links": [
{
"href": "https://www.sandbox.paypal.com/checkoutnowtoken=1KK44573EX7352015",
"rel": "approve",
"method": "GET"
}
]
}

I did this way:
As soon as Payment is successfully completed by customer the return_url gets called with query parameters : PayerID & token(orderID). At that time we can update user's payment status in our database (Amount is not deducted yet still because order is yet not approved or captured).
After that we can capture our order (Make sure invoice-id is not duplicate) otherwise status will be not completed.
If order is not approved on the time of capture we get this kind of error:
{
"name": "UNPROCESSABLE_ENTITY",
"details": [
{
"issue": "ORDER_NOT_APPROVED",
"description": "Payer has not yet approved the Order for payment. Please redirect the payer to the 'rel':'approve' url returned as part of the HATEOAS links within the Create Order call or provide a valid payment_source in the request."
}
],
"message": "The requested action could not be performed, semantically incorrect, or failed business validation.",
"debug_id": "47af43e..",
"links": [
{
"href": "https://developer.paypal.com/docs/api/orders/v2/#error-ORDER_NOT_APPROVED",
"rel": "information_link",
"method": "GET"
}
]
}
If there is duplicate invoice-id you will see error at the time of capture:
{
"name": "UNPROCESSABLE_ENTITY",
"details": [
{
"issue": "DUPLICATE_INVOICE_ID",
"description": "Duplicate Invoice ID detected. To avoid a potential duplicate transaction your account setting requires that Invoice Id be unique for each transaction."
}
],
"message": "The requested action could not be performed, semantically incorrect, or failed business validation.",
"debug_id": "86e0cc7f....",
"links": [
{
"href": "https://developer.paypal.com/docs/api/orders/v2/#error-DUPLICATE_INVOICE_ID",
"rel": "information_link",
"method": "GET"
}
]
}
If there is currency based issue:
{
"name": "UNPROCESSABLE_ENTITY",
"details": [
{
"location": "body",
"issue": "CURRENCY_NOT_SUPPORTED",
"description": "Currency code is not currently supported. Please refer https://developer.paypal.com/docs/integration/direct/rest/currency-codes/ for list of supported currency codes."
}
],
"message": "The requested action could not be performed, semantically incorrect, or failed business validation.",
"debug_id": "d666b5e5eb0c0",
"links": [
{
"href": "https://developer.paypal.com/docs/api/orders/v2/#error-CURRENCY_NOT_SUPPORTED",
"rel": "information_link",
"method": "GET"
}
]
}
If your order is successfully captured with status as COMPLETED:
{
"id": "8G0042477K865063U",
"status": "COMPLETED",
"purchase_units": [
{
"reference_id": "default",
"shipping": {
"name": {
"full_name": "John Doe"
},
"address": {
"address_line_1": "10, east street",
"address_line_2": "first building",
"admin_area_2": "Mumbai",
"admin_area_1": "Maharashtra",
"postal_code": "400029",
"country_code": "NZ"
}
},
"payments": {
"captures": [
{
"id": "4K670967VH2547504",
"status": "PENDING",
"status_details": {
"reason": "RECEIVING_PREFERENCE_MANDATES_MANUAL_ACTION"
},
"amount": {
"currency_code": "NZD",
"value": "170.00"
},
"final_capture": true,
"seller_protection": {
"status": "ELIGIBLE",
"dispute_categories": [
"ITEM_NOT_RECEIVED",
"UNAUTHORIZED_TRANSACTION"
]
},
"invoice_id": "INV-1234567888",
"links": [
{
"href": "https://api.sandbox.paypal.com/v2/payments/captures/4K670967VH2547504",
"rel": "self",
"method": "GET"
},
{
"href": "https://api.sandbox.paypal.com/v2/payments/captures/4K670967VH2547504/refund",
"rel": "refund",
"method": "POST"
},
{
"href": "https://api.sandbox.paypal.com/v2/checkout/orders/8G0042477K865063U",
"rel": "up",
"method": "GET"
}
],
"create_time": "2020-10-31T13:35:58Z",
"update_time": "2020-10-31T13:35:58Z"
}
]
}
}
],
"payer": {
"name": {
"given_name": "Sumit",
"surname": "Shukla"
},
"email_address": "testg32#gmail.com",
"payer_id": "VW87TYSM2GMZ4",
"address": {
"address_line_1": "10, east street",
"admin_area_2": "Mumbai",
"admin_area_1": "Maharashtra",
"postal_code": "400029",
"country_code": "NZ"
}
},
"links": [
{
"href": "https://api.sandbox.paypal.com/v2/checkout/orders/8G0042477K865063U",
"rel": "self",
"method": "GET"
}
]
}
After that you can redirect user to thank you page and update mobile app screen based on database values.

How to handle unknown response type with Retrofit

I am new to Retrofit and GSON
before retrofit, I have created a custom class for API calls, and map data manually.
This is my standard Response Type
{
"timestamp",
"status",
"message",
"payLoad",
"error"
}
If I GET the error from the server so my response is like
{
"timestamp":123456789,
"status":302,
"message":"Send All Data",
"error":"Partial Content"
}
If I get Success but Payload IS JSONObject so response like
{
"timestamp":123456789,
"status":200,
"message":"Save Successfully",
"payLoad":"{
"token": "...",
"userDetails": {
"id": 1,
"username": "...",
"firstName": "Deepak",
"lastName": "Gupta",
"gender": "MALE",
"address": ...,
"demoModel": {
"id": 1,
"demo": "enginner",
"demoConstant": "ENGINNER",
"active": true
},
"registrationDate": 1585831235533,
"enabled": true,
"expireTime": 4178010611915}
}
If I get Success but Payload IS JSONArray so response like
{
"timestamp": 1586330473808,
"status": 200,
"message": "SUCCESS",
"payLoad": [
{
...
},{
...
},{
...
}
]
}
I tried to make Payload to Object and then using InstanceOf I'll cast to respective model or List but then getting error linkedtreemap not cast to list or Object.

Strange Google Play Batch IAP API Error

According to the documentation for the Google Play Developer API, I should be able to batch insert or update requests. However, I’m running into an issue where it appears that either the documentation is wrong, the API is broken, or I’m just missing something.
I’m POSTing to the URL: https://www.googleapis.com/androidpublisher/v2/applications/inappproducts/batch?access_token=<my token here>&autoConvertMissingPrices=true'
MyContent-Typeis set to:application/json
And the body of myPOST` is the following:
{
"entrys": [{
"batchId": "<my batch id>",
"methodName": "update",
"inappproductsupdaterequest": {
"inappproduct": {
"packageName": "<my package name>",
"sku": "<my product sku>",
"status": "active",
"purchaseType": "managedUser",
"defaultPrice": {
"priceMicros": "<my price>",
"currency": "USD"
},
"listings": {
"en-US": {
"title": "<my title> ",
"description": "<my description>"
}
},
"defaultLanguage": "en-US"
}
}
}]
}
When I POST this, I get the following error:
{
"error": {
"errors": [
{
"domain": "global",
"reason": "required",
"message": "Required parameter: [entry[0].inappproductsUpdateRequest.package_name]",
"locationType": "parameter",
"location": "[entry[0].inappproductsUpdateRequest.package_name]"
}
],
"code": 400,
"message": "Required parameter: [entry[0].inappproductsUpdateRequest.package_name]"
}
}
If I’m reading this correctly, they want the package name parameter as a child element under inappproductsUpdateRequest. However, when I try moving or copying (tried both) "packageName": "<my package name>" as a child under inappproductsUpdateRequest, I get the error:
{
"error": {
"errors": [
{
"domain": "global",
"reason": "invalid",
"message": "Unknown field name: packageName",
"locationType": "other",
"location": "entrys.inappproductsupdaterequest"
}
],
"code": 400,
"message": "Unknown field name: packageName"
}
}
I get the same error when I try package_name instead of packageName.
Any thoughts?

Have you tried the requested casing inappproductsUpdateRequest that the response shows? I'm guessing you do need snake case on package_name rather than packageName, but you may need to try both there too.

How to see number of recipients for FCM

I make a request to https://fcm.googleapis.com/fcm/send with the following json data:
{
"to": "/topics/push_topic",
"data" : {
"language": "tr,en_us",
"ticker": "...",
"tickerEnglish": "...",
"body": "...",
}
}
The response I receive is the following (The message is sent successfully):
{
"message_id": xxxxxxxxxxxxx
}
But according to the documentation, I am supposed to receive a response like the following:
{
"multicast_id": 216,
"success": 3,
"failure": 3,
"canonical_ids": 1,
"results": [
{ "message_id": "1:0408" },
{ "error": "Unavailable" },
{ "error": "InvalidRegistration" },
{ "message_id": "1:1516" },
{ "message_id": "1:2342", "registration_id": "32" },
{ "error": "NotRegistered"}
]
}
So, why can't I see success and failure variables in my response? Is that because I send the message to a topic?
Thanks.

This is the expected response when sending to a topic.
The sample response with multiple results is for when you are using the registration_ids parameter when sending the message payload.

Parse JSON with facebook sdk

I was wondering how to get the value of "name" for the following json text with facebook sdk. Assuming I have already got the access token. Any thoughts? Many thanks!
enter code here
{
"id": "100005065353669",
"music": {
"data": [
{
"category": "Musician/band",
"name": "Eason Chan",
"id": "105468519487919",
"created_time": "2013-06-05T20:33:26+0000"
}
],
"paging": {
"next": "https://graph.facebook.com/100005065353669/musiclimit=5000&offset=5000&__after_id=105468519487919"
}
}
}