I can not make a payment using a test sandbox account - php

My web-based aplication receive paypal IPN, and I never had a problem with testing using the sandbox. Unfortunately, most recently at login to the test account to pay the test payment page becomes blank and nothing happens, or I can not choose the "pay with my paypal account" option. I was looking for answers and found to clean your cookies files but it did not help. Thank you for any advice.

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always login failed in paypal sandbox

I'm using PayPal-PHP-SDK in laravel according to this article to make a simple paypal payment gateway integration.
All things worked fine but each time to test a payment I redirect to payment page, can not login into my account and always shows me "Check your email address and password and try again".
I tried with other buyer accounts and get same error.
I followed all suggested solutions in this topic and this including clearing cookies and test in other browser but problem is not solved.
I do not know what is problem and how can I solve it ?

Specs met, but still: IPN was not sent, and the handshake was not verified. Please review your information

I've been trying to integrate my website with the PayPal IPN, but I've been unsuccessful so far. The Paypal documentation HERE: SSL Certificate Upgrade Microsite entails some specifications that need be met. My server supports SHA-256 and uses VeriSign G2 Root Certificate as well. I've installed SSL on this domain too, but still I get nothing with the Paypal IPN.
I have a file IPNSampleCode.php at (NOT MY REAL WEBSITE) https://XYXYXYX.com/IPN/IPNSampleCode.php which is supposed to be called by the Instant Payment Notification (IPN) Simulator, but I keep getting 'IPN was not sent, and the handshake was not verified. Please review your information.
' whenever I run the IPN simulator against the IPN handler URL 'https://XYXYXYX.com/IPN/IPNSampleCode.php'
What could I be missing, or what might I be doing wrong?
Thank you for contacting PayPal Merchant Technical Services, I apologize for the delay in responding to your email.
We are aware of this issue with our IPN Simulator and our development team is working on a fix. Until this issue is fixed, I'd suggest running your IPN tests by making payments in Sandbox as we do send IPN requests with every payment.
If you have a similar issue with your payment tests, please let us know and we can take a look.
My apologies for the inconvenience caused.

How to correctly integrate PayPal's API with paypal payments pro?

I just finished building a donation form on a client's website, which processes payments through PayPal's classic api. It works fine in Sandbox mode, but I'm getting a 10501 - This transaction cannot be processed due to an invalid merchant configuration. error.
I know that this error is caused by PayPal payments pro not being enabled on the account the API is trying to access. That is were I'm somewhat confused. The account I'm connecting this donation form to is subscribed to Paypal Payments Pro.
When I first encountered the 10501 error, I thought that PayPal may require myself to log in and enable the Payments Pro service. I found a "get started" button under the payments pro section of the site, but when I click it, I'm taken to a page which only provides a link to the API documentation.
I've never worked with PayPal's API before or launched a live paypal application. I'm hoping someone can point me in the right direction.
NOTES
Just to make it clear, the PHP donation form DOES work in PayPal's sandbox mode
I have acquired the correct API keys from the live account and I know for a fact that I did not mix up the live credentials with the sandbox.
this donation form is on a website, not an mobile app (do I still need to register it as a paypal app?)
Thanks
A lot of times what happens is that PayPal enables the Virtual Terminal for you, but not the DoDirectPayment API. I would just give them a call and let them know you have Pro, but your DDP calls are resulting in this error, and they can probably get it enabled for you.
It's also possible that your version of Pro requires you to use the PayFlow API instead of DoDirectPayment. That's something they can tell you when you call them.

Paypal user to user transaction using php webservice

My Requirement: We have an iphone app which will accept paypal login id and password of user and our web service should authenticate those details and if the user is a valid one, on next web service call will accept the details of second user and amount to transfer and the web service should make the payment automatically (without redirecting to paypal site).
Is there any facility available in paypal for this functionality. I have gone through adaptive payments of paypal but didn't find anything related to authentication. We have written the web service in php. Any sample code/ links would be helpful. Thanks
I believe this is what you're after. Specifically Login with PayPal and Seamless Checkout.
You might also want to look at Adaptive Payments, specifically Preapproval and Pay.

Using Paypal Express Checkout in appcelerator titanium

I am developing a mobile commerce application in Appcelerator Titanium and using Paypal as my payment gateway. I am using the Paypal's Express Checkout mechanism and doing all the Paypal interaction stuff in php scripts and calling those scripts through xhr object. My php scripts are working perfectly in the browser and payment is done displaying the thank you message, BUT when I try to call the php scripts from the app it redirects to paypal sandbox page displaying the message "Please login to use sandbox features" and nothing else.I am stuck here and can't do any advancement. It is to be noted that I am already logged in to sandbox through my sandbox account? I've spent so much time on searching this problem but couldn't get it working. Please help me what I am doing wrong here? I really need your help. Any help in this regard will be appreciated. Thanks in advance.
Have you tried using the PayPal module on the Appcelerator Marketplace? It's much easier to integrate and it's free:
https://marketplace.appcelerator.com/apps/780?693288467

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