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Is a java paypal api calling certificate mandatory?

I use Java and paypal express checkout and DoDirectPayment, I see that there are two options: a signature issued by a merchant account or a paypal comma provided by paypal sandbox.

Do I need any certificate if I use the string "signature"?

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enter image description here In SandBox, these two credentials (generated on the main SandBox account and the test account) are the same. This is for your convenience.

- , ""? , , . PayPal. API Signature - API; PayPal API.

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