paypal express sandbox not working before some days - asp.net

I have implemented PayPal express checkout on my site.And it's working fine on live website. But before some days my sandbox environment is not working , it getting error "Received an unexpected EOF or 0 bytes from the transport stream". I thing papal upgrade his version . Can anybody let me know what can i do change on my code for running papal sandbox .

Paypal is working on security updates available on the sandbox but not on the production environment yet. You can check this page (if not already) : https://devblog.paypal.com/upcoming-security-changes-notice/
Try to see if you have a more detailed log under your Paypal account.

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Cannot add custom domain to firebase

The custom domain wizard in firebase cannot go in the "verify ownership" stage. When I look at the web dev console I see a lot of 503 errors.
Is the spark plan not enough to have a custom domain ? Is the system broken ? Have I skip a step ?
For anyone else who ends up here, I did forward this on to Firebase Support.
They responded with 'That error appears when developers have a GSuite account. To solve the issue, reach out to your GSuite organization admin/owner to get the Search Console enabled. The following Google support article will provide the steps to enable the Search Console.'
Indeed, after enabling the Google Search Console, it did proceed to the Verify Domain step.

PayPal Standard Payment On Hold or Pending

I am using PayPal standard to make transactions in a WordPress website. I've set the API credentials and works perfectly means the transactions are done perfectly. But when I open the SandBox buyer account, I can see the following with pending status and the payments don't appear in the seller's account:
I've seen the PayPal official site to check this out and they say, sometimes they put on hold for verification. I would like to know if anyone has faced it before and how will this be available or completed later?
I've one another thing to know - I've used the PayPal Express Checkout plugin for transactions. But in the dashboard, it says WooCommerce Gateway PayPal Express Checkout requires OpenSSL >= 1.0.1 to be installed on your server and doesn't show the feature in the WooCommerce checkout settings. So do I have to set SSL for that?
Note: I am doing the above in localhost using WAMP.
You can't use localhost it's not a valid URL, PayPal can't access your local enviornment.Local host cannot be resolved on distant machines in case Paypal server.
Best way upload to the web, there's a number of free PHP web hosts out there if you don't have one.

Testing Sagepay with Woocommerce get Error: 5003 Internal Server Error

We're trying to test sagepay on a wordpress site with woocommerce and sagepay plugins installed. These are the steps we have been through and the results.
Entered all settings into the sagepayform gateway settings page in woocommerce, including Vendor Name, Testing (and Live) Encryption passwords, set Status to Testing, entered email adress etc.
created an account on test.sagepay.com
attempted to test the process by going through the checkout on the website (set up in a live testing domain)
When 'Place order' is pressed I get an error back on the test.sagepay.com website with HTTP Status Code 500, Error Code 5003 'Internal Server Error'
I did a test when the site was on my local environment which worked fine, now it doesn't.
Has anyone had any experience with this, any suggestions?
This is the result of Sagepay ending support for the test environment for protocol v2.2
From their notification email:
..please be aware that if you are testing accounts using our older
protocol, you will no longer be able to do so after 12th January,
2015.
You will need to move over to the v3 protocol and make the necessary changes to your code. More resources can be found within the migrate to v3 pages. The changes aren't vast, you mostly need to focus on the newly required fields and the string encryption.
A further note: production support for the v2 protocol ends in July 2015. Sagepay are very quiet about it but if your transactions are still going through on v2, it will show a warning in your My Sagepay account.

Paypal Sandbox Express Checkout Session Expired

I've been using my seller's and buyer's Paypal sandbox accounts to purchase fakes on my ecommerce and everything was working fine up until 1 hour ago.
Nothing has changed in my code, and I even tried to create and add new API credentials for my site, but every time I try to pay with Paypal Express I land to a "Session Expired" error page.
On someone else's machine the thing is still working.
It seems like no one on the net knows why, is it something to do with my browser?
Apparently, for no apparent reason, after a while you use Paypal's sandbox, you have to do the cleaning and delete all your cookies from Paypal to make it work.

Paypal api Insufficient permissions error on sale transaction

I'm using the Paypal Payflow api and receiving the following response error when trying to go live or in test:
RESULT=52&PNREF=xxxxxxxxxxx&RESPMSG=Insufficient permissions to perform transaction
From searching it seems there is a lot of people having issues with this. I also can't find error code 52 in any documentation that might help me resolve the issue. This thread explains the same unresolved issue: Paypal forum
Apparently my clients account was signed up for Payments Advanced and not Payments Pro. The upgrade has to be done over the phone, the online form will tell you that the application has already been approved.

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