Get Live Shipping Rates with Postmen

// Set to the API key of your Postmen account
let api_key = 'YOUR-POSTMEN-API-KEY';
// Set to false to use test shipper accounts
let is_production = true;
// Shipper accounts
let shipper_accounts = [
    { 'id': 'SHIPPER-ACCOUNT-ID-1' },
    { 'id': 'SHIPPER-ACCOUNT-ID-2' }
];
// Weight units for the store ('lb' or 'kg')
let weight_unit = 'lb';
// Length units for the store ('in' or 'cm')
let length_unit = 'in';
// Parcel dimensions
let parcel_width = 20,
    parcel_height = 10,
    parcel_depth = 10;



const shipment = cart['_embedded']['fx:shipment'];

let payload = {
    'async': false,
    'shipper_accounts': shipper_accounts,
    'shipment': {
        'parcels': [
            {
                'box_type': 'custom',
                'weight': {
                    'value': shipment['total_weight'],
                    'unit': weight_unit
                },
                'dimension': {
                    'width': parcel_width,
                    'height': parcel_height,
                    'depth': parcel_depth,
                    'unit': length_unit
                },
                'items': [
                    // Populated below
                ]
            }
        ],
        'ship_from': {
            'state': shipment['origin_region'],
            'postal_code': shipment['origin_postal_code'],
            'country': country_to_3(shipment['origin_country']),
        },
        'ship_to': {
            // Populated below
            'country': country_to_3(shipment['country']),
            'type': shipment['is_residential'] ? 'residential' : 'business'
        }
    },
    'is_document': false
};

// Ship to address
if (shipment['first_name']) {
    payload.shipment.ship_to['contact_name'] = shipment['first_name'] + " " + shipment['last_name'];
}
if (shipment['address1']) {
    payload.shipment.ship_to['street1'] = shipment['address1'];
}
if (shipment['city']) {
    payload.shipment.ship_to['city'] = shipment['city'];
}
if (shipment['region']) {
    payload.shipment.ship_to['state'] = shipment['region'];
}
if (shipment['postal_code']) {
    payload.shipment.ship_to['postal_code'] = shipment['postal_code'];
}

// Items
for (let p in cart['_embedded']['fx:items']) {
    let item = cart['_embedded']['fx:items'][p];

    let item_details = {
        'description': item.name,
        'quantity': item.quantity,
        'price': {
            'amount': item.price,
            'currency': cart.currency_code
        },
        'weight': {
            'value': item.weight,
            'unit': weight_unit
        }
    }

    if (item.sku) {
        item_details['sku'] = item.code
    }

    payload.shipment.parcels[0].items.push(item_details);
}

try {
    const endpoint = is_production ? 'https://production-api.postmen.com/v3' : 'https://sandbox-api.postmen.com/v3'
    const response = await fetch(endpoint + '/rates', {
        method: 'POST',
        body: JSON.stringify(payload),
        headers: {
            "postmen-api-key": api_key,
            "Content-Type": "application/json"
        }
    });
    const data = await response.json();

    if (data.meta.code != 200) {
        console.log(data.meta)
    }

    for (let r = 0; r < data.data.rates.length; r++) {
        const rate = data.data.rates[r];

        if (rate.service_name) {
            rates.add(10000+r, rate.total_charge.amount, '', rate.service_name);
        } else if (rate.error_message) {
            console.log(rate.error_message);
        }
    }
} catch(err) {
  console.log(err);
}

function country_to_3(country) {
    const iso3166_3 = {
        AF: 'AFG', AX: 'ALA', AL: 'ALB', DZ: 'DZA', AS: 'ASM', AD: 'AND', AO: 'AGO', AI: 'AIA', AQ: 'ATA', AG: 'ATG', AR: 'ARG', AM: 'ARM', AW: 'ABW', AU: 'AUS', AT: 'AUT', AZ: 'AZE', BS: 'BHS', BH: 'BHR', BD: 'BGD', BB: 'BRB', BY: 'BLR', BE: 'BEL', BZ: 'BLZ', BJ: 'BEN', BM: 'BMU', BT: 'BTN', BO: 'BOL', BA: 'BIH', BW: 'BWA', BV: 'BVT', BR: 'BRA', VG: 'VGB', IO: 'IOT', BN: 'BRN', BG: 'BGR', BF: 'BFA', BI: 'BDI', KH: 'KHM', CM: 'CMR', CA: 'CAN', CV: 'CPV', KY: 'CYM', CF: 'CAF', TD: 'TCD', CL: 'CHL', CN: 'CHN', HK: 'HKG', MO: 'MAC', CX: 'CXR', CC: 'CCK', CO: 'COL', KM: 'COM', CG: 'COG', CD: 'COD', CK: 'COK', CR: 'CRI', CI: 'CIV', HR: 'HRV', CU: 'CUB', CY: 'CYP', CZ: 'CZE', DK: 'DNK', DJ: 'DJI', DM: 'DMA', DO: 'DOM', EC: 'ECU', EG: 'EGY', SV: 'SLV', GQ: 'GNQ', ER: 'ERI', EE: 'EST', ET: 'ETH', FK: 'FLK', FO: 'FRO', FJ: 'FJI', FI: 'FIN', FR: 'FRA', GF: 'GUF', PF: 'PYF', TF: 'ATF', GA: 'GAB', GM: 'GMB', GE: 'GEO', DE: 'DEU', GH: 'GHA', GI: 'GIB', GR: 'GRC', GL: 'GRL', GD: 'GRD', GP: 'GLP', GU: 'GUM', GT: 'GTM', GG: 'GGY', GN: 'GIN', GW: 'GNB', GY: 'GUY', HT: 'HTI', HM: 'HMD', VA: 'VAT', HN: 'HND', HU: 'HUN', IS: 'ISL', IN: 'IND', ID: 'IDN', IR: 'IRN', IQ: 'IRQ', IE: 'IRL', IM: 'IMN', IL: 'ISR', IT: 'ITA', JM: 'JAM', JP: 'JPN', JE: 'JEY', JO: 'JOR', KZ: 'KAZ', KE: 'KEN', KI: 'KIR', KP: 'PRK', KR: 'KOR', KW: 'KWT', KG: 'KGZ', LA: 'LAO', LV: 'LVA', LB: 'LBN', LS: 'LSO', LR: 'LBR', LY: 'LBY', LI: 'LIE', LT: 'LTU', LU: 'LUX', MK: 'MKD', MG: 'MDG', MW: 'MWI', MY: 'MYS', MV: 'MDV', ML: 'MLI', MT: 'MLT', MH: 'MHL', MQ: 'MTQ', MR: 'MRT', MU: 'MUS', YT: 'MYT', MX: 'MEX', FM: 'FSM', MD: 'MDA', MC: 'MCO', MN: 'MNG', ME: 'MNE', MS: 'MSR', MA: 'MAR', MZ: 'MOZ', MM: 'MMR', NA: 'NAM', NR: 'NRU', NP: 'NPL', NL: 'NLD', AN: 'ANT', NC: 'NCL', NZ: 'NZL', NI: 'NIC', NE: 'NER', NG: 'NGA', NU: 'NIU', NF: 'NFK', MP: 'MNP', NO: 'NOR', OM: 'OMN', PK: 'PAK', PW: 'PLW', PS: 'PSE', PA: 'PAN', PG: 'PNG', PY: 'PRY', PE: 'PER', PH: 'PHL', PN: 'PCN', PL: 'POL', PT: 'PRT', PR: 'PRI', QA: 'QAT', RE: 'REU', RO: 'ROU', RU: 'RUS', RW: 'RWA', BL: 'BLM', SH: 'SHN', KN: 'KNA', LC: 'LCA', MF: 'MAF', PM: 'SPM', VC: 'VCT', WS: 'WSM', SM: 'SMR', ST: 'STP', SA: 'SAU', SN: 'SEN', RS: 'SRB', SC: 'SYC', SL: 'SLE', SG: 'SGP', SK: 'SVK', SI: 'SVN', SB: 'SLB', SO: 'SOM', ZA: 'ZAF', GS: 'SGS', SS: 'SSD', ES: 'ESP', LK: 'LKA', SD: 'SDN', SR: 'SUR', SJ: 'SJM', SZ: 'SWZ', SE: 'SWE', CH: 'CHE', SY: 'SYR', TW: 'TWN', TJ: 'TJK', TZ: 'TZA', TH: 'THA', TL: 'TLS', TG: 'TGO', TK: 'TKL', TO: 'TON', TT: 'TTO', TN: 'TUN', TR: 'TUR', TM: 'TKM', TC: 'TCA', TV: 'TUV', UG: 'UGA', UA: 'UKR', AE: 'ARE', GB: 'GBR', US: 'USA', UM: 'UMI', UY: 'URY', UZ: 'UZB', VU: 'VUT', VE: 'VEN', VN: 'VNM', VI: 'VIR', WF: 'WLF', EH: 'ESH', YE: 'YEM', ZM: 'ZMB', ZW: 'ZWE', XK: 'XKX'
    };

    return iso3166_3[country];
}