skAdNetwork for test but no callback to my interface URL

my public key:
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEpsi2TutTbaMwlGw2ARP6aoujCaN4
qHiSyU3mhtbVw1SMkFj8mof7BvRHAEde9+SKGDt4pQo35Y9umeCBKZSbTw==
my signature and parameter:
{
    "version":"2.0",
    "ad-network-id":"rpyys9h7k4.skadnetwork",
    "campaign-id":"123",
    "itunes-item-id":"1103079009",
    "nonce":"5a30c55a-b261-4e65-b9a0-b31cab4b57cc",
    "source-app-id":"1549454422",
    "timestamp":"1618988764924",
    "signature":"MEUCIQCbrSJwZX5Dy03TL5ZfSPBr/SmcW3O43qcOeVf0hjFL5wIgJtKU4aQW3jhKRsnf7TSNAC9Vv36RPI/KJqw3WdYxqA8="
}