J'ai mis en place un système d'abonnement sur mon site.
Concernant le paiement et le retour sur le site, ca se passe bien.
Par contre ,pour les notifications de paiements instantanées, ca ne marche pas (même en activant cette option sur mon compte paypal (avec l'url )).
J'ai testé mon adresse pour les notifications sur le simulateur de paypal : ca mouline assez longtemps et finit par une page d'erreur de chargement.

Je pense que c'est un problème d'accés à mon site donc une configuration particulière d'apache à mettre en place.

voici le log d'erreur:
* Connection #1 to host api-3t.sandbox.paypal.com left intact
* About to connect() to api-3t.sandbox.paypal.com port 443 (#2)
* Trying 23.43.75.42...
* Connected to api-3t.sandbox.paypal.com (23.43.75.42) port 443 (#2)
* successfully set certificate verify locations:
* CAfile: C:\Program Files (x86)\EasyPHP-DevServer-13.1VC9\data\localweb\projects\monsite\app\Vendor\cacert.pem
CApath: none
* SSL connection using RC4-SHA
* Server certificate:
* subject: C=US; ST=CALIFORNIA; L=San Jose; O=PayPal, Inc.; OU=Partner Support; CN=api-3t.sandbox.paypal.com
* start date: 2013-08-20 00:00:00 GMT
* expire date: 2015-08-21 23:59:59 GMT
* subjectAltName: api-3t.sandbox.paypal.com matched
* issuer: C=US; O=VeriSign, Inc.; OU=VeriSign Trust Network; OU=Terms of use at https://www.verisign.com/rpa (c)10; CN=VeriSign Class 3 Secure Server CA - G3
* SSL certificate verify ok.
> POST /nvp HTTP/1.1
Host: api-3t.sandbox.paypal.com
Accept: */*
Content-Length: 745
Content-Type: application/x-www-form-urlencoded

* upload completely sent off: 745 out of 745 bytes
< HTTP/1.1 200 OK
< Server: Apache
< Content-Length: 1096
< Content-Type: text/plain; charset=utf-8
< DC: origin1-api-3t.sandbox.paypal.com
< Date: Thu, 03 Oct 2013 10:37:50 GMT
< Connection: keep-alive
< Set-Cookie: DC=origin1-api-3t.sandbox.paypal.com; secure
<
* Connection #2 to host api-3t.sandbox.paypal.com left intact
* About to connect() to api-3t.sandbox.paypal.com port 443 (#3)
* Trying 23.43.75.42...
* Connected to api-3t.sandbox.paypal.com (23.43.75.42) port 443 (#3)
* successfully set certificate verify locations:
* CAfile: C:\Program Files (x86)\EasyPHP-DevServer-13.1VC9\data\localweb\projects\monsite\app\Vendor\cacert.pem
CApath: none
* SSL connection using RC4-SHA
* Server certificate:
* subject: C=US; ST=CALIFORNIA; L=San Jose; O=PayPal, Inc.; OU=Partner Support; CN=api-3t.sandbox.paypal.com
* start date: 2013-08-20 00:00:00 GMT
* expire date: 2015-08-21 23:59:59 GMT
* subjectAltName: api-3t.sandbox.paypal.com matched
* issuer: C=US; O=VeriSign, Inc.; OU=VeriSign Trust Network; OU=Terms of use at https://www.verisign.com/rpa (c)10; CN=VeriSign Class 3 Secure Server CA - G3
* SSL certificate verify ok.
> POST /nvp HTTP/1.1
Host: api-3t.sandbox.paypal.com
Accept: */*
Content-Length: 745
Content-Type: application/x-www-form-urlencoded

* upload completely sent off: 745 out of 745 bytes
< HTTP/1.1 200 OK
< Server: Apache
< Content-Length: 1097
< Content-Type: text/plain; charset=utf-8
< DC: origin1-api-3t.sandbox.paypal.com
< Date: Thu, 03 Oct 2013 10:42:10 GMT
< Connection: keep-alive
< Set-Cookie: DC=origin1-api-3t.sandbox.paypal.com; secure
<
* Connection #3 to host api-3t.sandbox.paypal.com left intact
Merci de votre aide (ca fait 3 jours qu je m'arrache les cheveux et je suis devenu presque chauve ).