PayPal Module problem

Hello,
first; I setup my system on a centos7 with selinux disabled
Dolibarr current version (Programs) 13.0.2

PHP Ver = 7.3.28
|MBString| Loaded - This PHP supports MBString functions.|
|JSON| Loaded - This PHP supports JSON functions.|
|GD| Loaded - This PHP supports GD functions.|
|Curl| Loaded - This PHP supports Curl functions.|
|Intl| Loaded - This PHP supports Intl functions.|
|IMAP| Loaded - This PHP supports IMAP functions.|
|xDebug|No - Your PHP installation does not support xDebug functions.|

MySQL or MariaDB 5.5.5-10.2.38-MariaDB ← with root access

Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips PHP/7.3.28

I have a problem with Paypal Module
I configured it (API username - API password - API signature)
tls v1

the problem is : when I add an invoice and send the link to the customer (by Email or manually)
they are able to pay and I receive payment on PayPal …BUT…
it does not reflect that the invoice was paid on Dolibarr - stays marked as “unpaid” on the Dolibarr while I already received the money on Paypal

can anyone help me ?

thanks

Paula.

I actually Installed another VPS and the problem still the same .
any ideas ?