How to add money to a Paypal sandbox account, after it has been created?

If you need actual funds in that account you could use Send Money from another sandbox account and pay the account you want to fund.

You really don't need funds in the account to test payments, though. As long as the account is verified and confirmed it'll fall to "Instant Transfer" and you won't have any problems sending payments using that account.

1. Login using your developer PayPal account https://developer.paypal.com/
2. Go to 'My Account' on the top right section of the page.
3. Go to Accounts under Sandbox.
4. See your sandbox account and click on the Clone link.
5. Fill the details and mention the amount you want to have and click on Create.

This is helpful in case if the amount in the existing sandbox account is exhausted.

Don't go to sandbox, go to developer.paypal.com Log in with your real paypal account (not sandbox). Go to Sandbox - > Accounts on the left. Click in the button "Create account" You will be able to add any amount you want.

Follow these steps:-

1. Go to https://developer.paypal.com/developer/accounts/
2. Click on the email address used for the account (email address)
3. Now two option you will get --> Profile and notification (just below that email you clicked)
4. Choose profile then a popup will come
5. Now choose funding tab in popups.
6. Now at the bottom choose edit button and edit the balance and save.

That's it.