Can I get notification with data at specific url when users who connected PayPal to my app throught Oauth2 will get payment? I know it possible with IPN, but then each user need to add my url in their account settings. Is any another way?
Update: Or can I manually get information about last user transactions(completed outside my app)?
There are a number of ways to accomplish what you're trying to do, I think.
You mentioned IPN, and that would be the best way. You can specify the NotifyURL in your standard button code or API requests (depending on how you're setting up the payments) so that IPNs for those payments will be sent to your IPN URL. That way you don't have to have users set that up in their own account.
Alternatively (or in conjunction with), you could use the Permissions API to allow users to authenticate your app to make API calls on their behalf. Then you can use the TransactionSearch and GetTransactionDetails APIs to pull any info you need about their account transaction history.
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I have tested my paypal payment with sandbox account using my API details. Now I want to use Clients API details for sandbox and changed code accordingly. But it still redirects me to the previous store.
Any idiea what is wrong i am doing.
it looks like your code didn't change the API credentials in some way. Try to check again the new APIs that you want to use and replace the previous one.
Usually, for example in ExpressCheckout, when you initially call the SetExpressCheckout you provide the API credentials of the seller so that when the checkout is displayed you can connect to the seller shop to pay and all the money will be directed there.
I have a bunch of customers who would like to create and send invoices directly from my web application (without logging in to theirs paypal account). Is that possible to create paypal api which will manage invoices for different paypal accounts (not mine). Of course my application will hold their account data.
Thanks.
You could have your users manually grant API permissions from their PayPal account for your application to make API calls on their behalf.
Once they've done that, you would include the SUBJECT parameter with their PayPal account ID or email address as the value, and you would continue to use your own API USER, PWD, and SIGNATURE. This way the application calls would be made with your account, but any action that occurs would happen on the 3rd party account.
If you want to make this a little easier on your users (and yourself since you won't have to support them so much) you can use the Permissions API. This allows you to setup a way within your application for users to approve your application to make the calls it needs to make, and then you would be working with OAuth tokens instead of their email/account ID.
Using the PayPal permissions API can you receive notifications from payments made after a customer clicks on a payment button, proceeds to PayPal, and then pays?
I notice they have IPN, but will this work with the permissions API?
Thanks!
You can include NotifyURL in your API requests to set a URL for IPN to POST data to. It's not something that technically "works with the permissions API" but any transaction that is made would indeed trigger the IPN.
If you're building an app for 3rd parties to use, though, and you're passing NotifyURL in your API requests, that will override any IPN configuration each individual merchant using your tool might have setup on their own. This can cause frustration for such users because then their own IPN solution doesn't get hit when they take payments through your app.
If you're going to do that I recommend setting up a way for your users to enter their own IPN URL in your app settings, and then if they have a value, forward the POSTed data to their URL when PayPal sends it to yours. That way both IPN scripts will get hit and process the data accordingly.
Is there a way to use the paypal API to send basic details of a payment without actually creating the payment itself? What I mean is, I'm working with a non profit organization that does not currently employ SSL. They want to use paypal to accept donations, but they want their own branded form on their page, they don't want to use the simple donate button. I had thought I might be able to send basic details, such as name and address along with the amount they wish to donate and a few other details using the paypal API, and then have the actual payment information processed on paypal's secure servers. All the examples I can find on how to use their API however are creating complete payments and sending them to Paypal, something I'm not able to do for obvious reasons. Short of employing SSL, something that we should probably do anyways, and capturing a complete payment, is there a way of sending just select information over the API and handling the rest on paypal's end?
If you want to control the form itself you don't have any choice but to go SSL. Any other route would require sending the user to PayPal, where you would no longer have that control.
A user clicks on a buy now button on my website which takes them to PayPal where they can purchase my item. I then receive the relevant information through my IPN listener. This all works fine with sandbox accounts.
To implement this with my live business account, am I right in thinking I don't need to worry about creating live API certificates etc? I understand this is needed when making API calls to live accounts but I'm assuming a simple buy now button doesn't need this stuff setup.
Correct. You only need API credentials when you will make an API call. IPN is a push notice, so PayPal is sending the data to you instead. All you need to do is post the data back to PayPal to verify it and then process the POST data.