paypal

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Yes. PayPal is an easy and secure way to start accepting payments online. It's also a well-known payment method that your shoppers trust. If you already have a website, use our payment buttons to accept debit card, credit card, and bank account payments—setup only takes a few minutes.
https://www.paypal.com/in/cgi-bin/webscr?cmd=xpt/Marketing/general/how-to-use-paypal-outside.

To integrate paypal with php here is the process.

for the developer we have a sand.paypal.com this is test site of paypal means here u can test ur output of paypal.After successfull result with this accout you can change the original paypal accout

here we have two urls one is main account another one is testing
https://www.paypal.com/in/webapps/mpp/home
https://www.sandbox.paypal.com/in/webapps/mpp/home

first we learn about sandbox means test account.First u have to register

click on sign up button then you will see

choose your choice and click on continue button then you will see some text boxess fill the details then click on .,