The PayPal API Username is provided by PayPal to allow API access.
To obtain PayPal Credentials you will need a Verified PayPal Business Account and a PayPal Sandbox Account. A PayPal Sandbox Account allows the Application Developer to build and test the application without using real money or paying PayPal fees. Applications that are Development or Testing will only make calls to the sandbox. Only applications that are in Production can make calls to the live PayPal environment and all calls that are completed in Production will incur real money transfers and PayPal fees.
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