Compliance Notice: By June 30, 2018, any system that connects to PayPal via HTTPS must support TLS 1.2 or higher. To avoid any disruption of services, ensure your systems are ready.

You must have a PayPal Business Account.
For live transactions, you must enable SSL / https for your domain. 
If you use PayPal – use currencies supported by PayPal – 

The settings for PayPal can be found in Theme Options – Membership – PayPal Settings.

Step1: Create the PayPal processor page

The page itself is not a link that should be accessed directly. The API will use it to communicate with the theme and the merchant. You will see a generic message when opening the URL in the browser. It’s correct and there is no issue with the page.
Have only 1 page with this template!!!!!

d

Step2: Login at https://developer.paypal.com to create the API

Optional: If you wish to test with sandbox mode (all transactions are purely fictional) you must create your own business sandbox account from Sandbox – Accounts and select it when you add a new app.

Go to My APPS to create the new app:

Type the APP name and select the sandbox email (will be useful if you wish to test sandbox mode before doing live transactions)

Copy the Client ID and Secret id.

Be careful when copy SANDBOX or LIVE. You must set the theme options to match Sandbox or Live too. See STEP3.

Step3: Select if you wish to use Sandbox (a test environment) or Live (real transactions)

Go to Theme options – Membership – Membership settings:

 

Step4: Enable PayPal and Add the API Details

Step4.1 If you wish to use SANDBOX, copy the sandbox credentials from https://developer.paypal.com

Step 4.2 – Copy the live credentials if you wish to do real payment transactions

Step5: Add your paypal email to receive payments

Add your sandbox email to test payments or your live paypal for real payments.

 

Step6: Add the PayPal Processor URL in your PayPal account

For sandbox tests, you must go to https://www.sandbox.paypal.com/, login with the sandbox account you created at step 2.

For live tests, go to https://www.paypal.com

s

 

s

When PayPal does not work please check the following:

-only one Payment Processor page with template Paypal Processor can be created. If there is a duplicate of this page, PayPal will not work.

-you need to have values bigger than 0 for “Price Per Submission” and “Price to make the listing featured”, if “Per Listing” mode is enabled.

Important! PayPal doesn’t work if in membership packages titles use punctuation.

PayPal errors and solutions:

Received%20error:%20400Raw%20response:%7B%22name%22:%22VALIDATION_ERROR%22,%22debug_id%22:%2279a5da9bed9ed%22,%22message%22:%22Invalid%20request%20-%20see%20details%22,%22information_link%22:%22https:/developer.paypal.com/webapps/developer/docs/api/%22,%22details%22:%5B%7B%22field%22:%22name%22,%22issue%22:%22Value%20too%20long%20%28max%20length%2050%29%22%7D%5D%7D

Value too long – error

Help paypal – https://developer.paypal.com/docs/api/

Refers to your website tagline. Which is longer than the allowed characters. Change that shorter in Theme Options – General Settings.


 

Received%20error:%20401Raw%20response:{%22error%22:%22invalid_client%22,%22error_description%22:%22Client%20Authentication%20failed%22}

Error says you have wrong API copied.

Make sure you didn’t copy a blank space by accident.

Make sure you use sandbox with sandbox credentials and live with live credentials.


 

Important! PayPal doesn’t work if in membership packages titles use punctuation.


14077410:SSL%20routines:SSL23_GET_SERVER_HELLO:sslv3%20alert%20handshake%20failure

Please see this url with a similar issuehttp://stackoverflow.com/questions/34926940/php-paypal-error-14077410ssl-routinesssl23-get-server-hellosslv3-alert-hands

And the solution:

Support SHA-256. PayPal is upgrading SSL certificates on all Live and Sandbox endpoints from SHA-1 to the stronger and more robust SHA-256 algorithm. You will need to update your integration to support certificates using SHA-256.

Discontinue use of the VeriSign G2 Root Certificate. In accordance with industry standards, PayPal will no longer honor secure connections that require the VeriSign G2 Root Certificate for trust validation. Only secure connection requests that are expecting our certificate/trust chain to be signed by the G5 Root Certificate will result in successful secure connections.

This document has the details to fwd to hosting:

https://www.paypal-knowledge.com/resources/sites/PAYPAL/content/live/FAQ/1000/FAQ1766/en_US/2015%20Merchant%20Security%20System%20Upgrade%20Guide%20%28U.S.%20English%29.pdf