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There are many reasons why an API call to the Sandbox endpoints will receive a 500 Internal Server Error. One of which is if you are attempting Direct Payment Recurring Payment on a Sandbox account that is not setup for Pro or Recurring Payments. From the   Sandbox Account Creation Page  on the PayPal Developer site:    Log into the Dashboard on https://developer.paypal.com On the Profile tab of the Business account, click the Account type: Upgrade to Pro link. Click the Enable which appears in the window. Try your API call again after you have ensured that the Sandbox Account is upgraded to Pro. If you receive DPRP disabled, this means that your Sandbox Account is not setup for Recurring Payments. Since all Sandbox Endpoints were updated to only support TLS 1.2 connections when communicating in https, you will also need to ensure that you are communicating with the highest level of TLS available. In case you need it here is the information on the TLS 1.2 upgrade.   Thanks, Jennifer   ... View more

Since the link that is listed in this post is not a valid PayPal endpoint link, this is the reason that an error message is being received. Here are a few options to resolve the issue. You can recreate the Subscription button from inside your PayPal Account, or go into "My Saved Buttons" and re-copy and paste the existing button code to your website. Here’s how to create PayPal payment buttons: Log in to your PayPal account. Click Tools at the top of the page. Click PayPal Buttons under "Accept Payments anywhere." Click Create a Button or Learn more about buttons for more information. Click on email tab to use the email URL link (if available) Every payment button you create can be saved in your PayPal account. In "My Saved Buttons," you can change most button characteristics, view the HTML code or create new buttons that are similar to existing ones.   Thank you, Jennifer ... View more

One of the Reports options within PayPal Here is Sales By User. If you have secondary users that have processed payments you will be able to see a report of their sales. You should be able to see a report on Details of items sold as well. At this time there is not a report by Categrory Here is the information on the different reports available in PayPal Here: To access the in-app sales reports feature for PayPal Here on an iPhone or Android phone: Login to the PayPal Here App. Tap Sales Activity under "Settings." Tap Sales Reports. The Sales Report feature will first display the Sales Summary report for the current day. (Swipe the screen from left to right or click on the < to view the report for the previous day.) Tap the Daily label to change the view to Weekly, Monthly, Yearly or select Specify Date. Select the desired start date and end date to generate a custom report for a specific date range. From the main Sales Summary page, tap View Details to access additional data for the current period.   Sales by Payment Type and Items Sold From the View Details page, view a breakdown of your Sales by Payment Type and a breakdown of Items Sold. Sales by User If you have set-up multiple users to take payment on your behalf during the reported time period, you can view a breakdown of Sales by User (note: secondary users are only available for PayPal Business Accounts). Tap on a user name to view additional user details. View a full breakdown of sales activity, including tips, for a specific user. Thanks, Jennifer ... View more

Here is some information on Recurring Payments using the Hosted Checkout Pages. You can create a Recurring Payment's Profile from an existing Transaction ID that was processed through the Hosted Checkout Pages. If the transactions is a Credit Card Transaction then the ORIGID which is the Transaction ID is needed to create the Recurring Payment's Profile. If the transaction is a PayPal Transaction then a Billing Agreement is needed. Please keep in mind that you need to obtain consent from your buyers to create a Recurring Profile. Action Add From the PayPal Developer Site: "Specify the PNREF   (TransactionID) of the transaction to use it as a template, and optionally supply additional payment data." Here is an example from a Credit Card Transaction request from the PayPal Developer Site: TRXTYPE=R&TENDER=C&PARTNER=PayPal&VENDOR=Acme&USER=Acme&PWD=a1b2c3d4&ACTION=A &PROFILENAME=RegularSubscription&ORIGID=XYZ123&START=12012013&PAYPERIOD=WEEK&TERM=12 &OPTIONALTRX=S&OPTIONALTRXAMT=2.00&COMMENT1=First-time customer&AMT=42.00  Thank you, Jennifer ... View more

Here is the documentation on server side Rest API setup:   Server Side Rest API Integration   Here is the request to get the access token: Access Token Request   Complete Request on your server: Create Payment Request   Complete SDK for PHP Rest API Payments: PHP SDK for Rest API Payments   Thank you, Jennifer ... View more

PayPal For Marketplaces will allow Recurring Payments through Channel Billing Agreements. Below is documentation on the Order Operation: PayPal For Marketplaces Order Operation   Thank you, Jennifer ... View more

Directly from the documentation on Webhooks below is what happens if your endpoint does not respond: "Important: If your webhook endpoint is unavailable or takes too long to respond, PayPal resends the notification message 25 times over the course of three days until a successful response is given."   Below is the direct link to the Webhook Integration: Webhook Integration   If you are logged into the PayPal Developer Dashboard there is a section that shows Live Webhook Events. It will show you Webhook Events over the past 30 days.   Thank you, Jennifer ... View more

If you are using Express Checkout Js4 you can use the payment confirmation method. This method would bring the buyer back to your website to complete the purchase. Below is the interactive demo for the payment confirmation method: Interactive Demo   Thank you, Jennifer ... View more

List of Braintree Error Messages: From the Braintree Documentation: "3000 Processor Network Unavailable – Try Again This response could indicate a problem with the back-end processing network, not necessarily a problem with the payment method." It can also mean that your Client Token is incorrect or you are in a country that Braintree Express Checkout is not available. To check if your Braintree Express Checkout is supported by your country click here: Braintree Express Checkout Supported Countries   Here is information on generating a Client Token.   Thank you, Jennifer   ... View more

Based on the information provided in this post, and all of the documentation available, node.js would be a good option for you with integrating Payouts. I looked through all the mobile documentation specific to iOS and there is no SDK for Payouts and iOS available. Below is the Payouts Example Code and the Node.js SDK for Payouts. Example Payouts Code   Node .js SDK   Thanks, Jennifer ... View more