paypal authentication failure in sandbox - authentication

Question

I encounter an issue when I try to use the Paypal sandbox API.
I've created my 2 sandbox accounts (the facilitator and the buyer), and I've created my app to get the credentials.
Then, I use the curl example provided by Paypal to get a token :
curl -v https://api.sandbox.paypal.com/v1/oauth2/token \
-H "Accept: application/json" \
-H "Accept-Language: en_US" \
-u "my-client-id:my-secret" \
-d "grant_type=client_credentials"
I get a 200 response, with an "access_token".
Then, I use this access token to get another resource, for example :
curl -v -X GET https://api.sandbox.paypal.com/v1/invoicing/invoices?page=3&page_size=4&total_count_required=true \
-H "Content-Type: application/json" \
-H "Authorization: Bearer the-token-received-above"
Then, I get a 401 error :
{
"name":"AUTHENTICATION_FAILURE",
"message":"Authentication failed due to invalid authentication credentials or a missing Authorization header.",
"links":[{
"href":"https://developer.paypal.com/docs/api/overview/#error",
"rel":"information_link"
}]
}
I don't understand what I'm doing wrong, since I've followed every step decribed in the Paypal doc (at least, I think I have... probably not)
Thanks for your help

Answer 1

curl -v -X GET "https://api.sandbox.paypal.com/v1/invoicing/invoices?page=3&page_size=4&total_count_required=true" \
-H "Content-Type: application/json" \
-H "Authorization: Bearer the-token-received-above"
Actually had this exact same issue but didn't know what was wrong with my curl. For me, the issue was I forgot to put "Bearer" in the Authorization section.
For this, you are required to wrap the URL with quotation marks.

Answer 2

After get access_token. Please try this
try {
$params = array('access_token' => $jsonResponse->access_token);
$userInfo = OpenIdUserinfo::getUserinfo($params, $this->_api_context);
} catch (Exception $ex) {
ResultPrinter::printError("User Information", "User Info", null, $params, $ex);
exit(1);
}
ResultPrinter::printResult("User Information", "User Info", $userInfo->getUserId(), $params, $userInfo);
Don't forget to add
use PayPal\Api\OpenIdTokeninfo;
use PayPal\Api\OpenIdUserinfo;
That's worked for me.