iOS Receipt Validation from Server Side

I am using my backend server to validate the iOS receipt. For that all I’ve done is passed the purchase.transactionReceipt to the application server in a post request. I want to know if purchase.transactionReceipt returns a base64 encoded receipt data or what? I’m getting error: 21002 with the current implementation

requestServerForReceiptVerification = (purchase: InAppPurchase | SubscriptionPurchase) => {
        const receipt = purchase.transactionReceipt;
        if (receipt) {
            // Hit Server API for Receipt Validation
            if (Platform.OS == 'ios') {
                let headers = {
                    'Content-Type': 'application/json'
                }
                Stores.UserStore.hitVerifyiOSReceiptAPI(receipt, headers, this.dropdown, (response: any) => {
                    finishTransaction(purchase).then(() => {
                        console.warn('Trasaction Finished');
                    }).catch((error) => {
                        console.warn(error.message);
                    })
                })
            } 
        }
    }

[bang9]

check this one

const IOS_SHARED_PWD = "********";

async function validateIOS() {
    const latestPurchase = await getLatestPurchase();
    if (latestPurchase) {
        return false;
    }

    return RNIap.validateReceiptIos(
        {
            "receipt-data": latestPurchase.transactionReceipt,
            "password": IOS_SHARED_PWD,
            "exclude-old-transactions": false
        },
        false
    )
        .then(uncheckedValidation => {
            //check test receipt
            if (uncheckedValidation?.status === 21007) {
                return RNIap.validateReceiptIos(
                    {
                        "receipt-data": latestPurchase.transactionReceipt,
                        "password": IOS_SHARED_PWD,
                        "exclude-old-transactions": false
                    },
                    true
                );
            } else {
                return uncheckedValidation;
            }
        })
        .then(checkedValidation => {
            return isValidReceipt(checkedValidation);
        });
}

function getLatestPurchase() {
    return RNIap.getAvailablePurchases().then(purchases => {
        return purchases?.sort((a, b) => Number(b.transactionDate) - Number(a.transactionDate))?.[0] || null;
    });
}

function isValidReceipt(checkedValidation) {
    if (!checkedValidation) {
        return false;
    }

    // check is valid validation request
    if (checkedValidation.status === 21006 || checkedValidation.status === 21010) {
        return false;
    }

    const { latest_receipt_info: latestReceiptInfo } = checkedValidation;
    const latestReceipt = latestReceiptInfo
        ?.sort((a, b) => Number(b.purchase_date_ms) - Number(a.purchase_date_ms))
        ?.find(receipt => receipt.product_id === "some.product.id")?.[0];

    // no receipt
    if (!latestReceipt) {
        return false;
    }

    // refunded receipt
    if (latestReceipt.cancellation_date) {
        return false;
    }

    // expired receipt
    if (Number(latestReceipt.expires_date_ms) < Date.now()) {
        return false;
    }

    return checkedValidation.status === 0;
}

[InfiniteDreamz]

@leelandclay Thanks for putting up your solutions. This really helped a lot and we finally were able to validate our receipt. Thanks !!