Rates provided by the API differs from the invoice.

When requestiing rates via your API we are getting different prices than the one invoiced.

For example this request :

POST https://api.easyship.com/rate/v1/rates
{
"origin_country_alpha2":"US",
"origin_postal_code":"96707",
"destination_country_alpha2":"CA",
"destination_postal_code":"N6J4L8",
"taxes_duties_paid_by":"Receiver",
"is_insured":false,
"items":[
{
"actual_weight":2.0,
"height":28,
"width":16,
"length":36,
"category":"accessory_no_battery",
"declared_currency":"EUR",
"declared_customs_value":0
}
]
}

We are getting an offer for Fedex International Priority at $29.77.

But for a shipment with the same specifications ESUS11472890, we are getting invoiced $81.08.

A quote on the dashboard (4lbs 14in11in6in) gives the same amount as the API.

I don't find any mistake on our side.
Can you help ?