public async Task <IActionResult> PostIpn()
{
if (HttpContext?.Request?.Query == null)
{
return(new BadRequestResult());
}
var key = HttpContext.Request.Query.ContainsKey("key") ?
HttpContext.Request.Query["key"].ToString() : null;
if (key != _billingSettings.PayPal.WebhookKey)
{
return(new BadRequestResult());
}
string body = null;
using (var reader = new StreamReader(HttpContext.Request.Body, Encoding.UTF8))
{
body = await reader.ReadToEndAsync();
}
if (string.IsNullOrWhiteSpace(body))
{
return(new BadRequestResult());
}
var verified = await _paypalIpnClient.VerifyIpnAsync(body);
if (!verified)
{
_logger.LogWarning("Unverified IPN received.");
return(new BadRequestResult());
}
var ipnTransaction = new PayPalIpnClient.IpnTransaction(body);
if (ipnTransaction.TxnType != "web_accept" && ipnTransaction.TxnType != "merch_pmt" &&
ipnTransaction.PaymentStatus != "Refunded")
{
// Only processing billing agreement payments, buy now button payments, and refunds for now.
return(new OkResult());
}
if (ipnTransaction.ReceiverId != _billingSettings.PayPal.BusinessId)
{
_logger.LogWarning("Receiver was not proper business id. " + ipnTransaction.ReceiverId);
return(new BadRequestResult());
}
if (ipnTransaction.PaymentStatus == "Refunded" && ipnTransaction.ParentTxnId == null)
{
// Refunds require parent transaction
return(new OkResult());
}
if (ipnTransaction.PaymentType == "echeck" && ipnTransaction.PaymentStatus != "Refunded")
{
// Not accepting eChecks, unless it is a refund
_logger.LogWarning("Got an eCheck payment. " + ipnTransaction.TxnId);
return(new OkResult());
}
if (ipnTransaction.McCurrency != "USD")
{
// Only process USD payments
_logger.LogWarning("Received a payment not in USD. " + ipnTransaction.TxnId);
return(new OkResult());
}
var ids = ipnTransaction.GetIdsFromCustom();
if (!ids.Item1.HasValue && !ids.Item2.HasValue)
{
return(new OkResult());
}
if (ipnTransaction.PaymentStatus == "Completed")
{
var transaction = await _transactionRepository.GetByGatewayIdAsync(
GatewayType.PayPal, ipnTransaction.TxnId);
if (transaction != null)
{
_logger.LogWarning("Already processed this completed transaction. #" + ipnTransaction.TxnId);
return(new OkResult());
}
var isAccountCredit = ipnTransaction.IsAccountCredit();
try
{
var tx = new Transaction
{
Amount = ipnTransaction.McGross,
CreationDate = ipnTransaction.PaymentDate,
OrganizationId = ids.Item1,
UserId = ids.Item2,
Type = isAccountCredit ? TransactionType.Credit : TransactionType.Charge,
Gateway = GatewayType.PayPal,
GatewayId = ipnTransaction.TxnId,
PaymentMethodType = PaymentMethodType.PayPal,
Details = ipnTransaction.TxnId
};
await _transactionRepository.CreateAsync(tx);
if (isAccountCredit)
{
string billingEmail = null;
if (tx.OrganizationId.HasValue)
{
var org = await _organizationRepository.GetByIdAsync(tx.OrganizationId.Value);
if (org != null)
{
billingEmail = org.BillingEmailAddress();
if (await _paymentService.CreditAccountAsync(org, tx.Amount))
{
await _organizationRepository.ReplaceAsync(org);
}
}
}
else
{
var user = await _userRepository.GetByIdAsync(tx.UserId.Value);
if (user != null)
{
billingEmail = user.BillingEmailAddress();
if (await _paymentService.CreditAccountAsync(user, tx.Amount))
{
await _userRepository.ReplaceAsync(user);
}
}
}
if (!string.IsNullOrWhiteSpace(billingEmail))
{
await _mailService.SendAddedCreditAsync(billingEmail, tx.Amount);
}
}
}
// Catch foreign key violations because user/org could have been deleted.
catch (SqlException e) when(e.Number == 547)
{
}
}
else if (ipnTransaction.PaymentStatus == "Refunded")
{
var refundTransaction = await _transactionRepository.GetByGatewayIdAsync(
GatewayType.PayPal, ipnTransaction.TxnId);
if (refundTransaction != null)
{
_logger.LogWarning("Already processed this refunded transaction. #" + ipnTransaction.TxnId);
return(new OkResult());
}
var parentTransaction = await _transactionRepository.GetByGatewayIdAsync(
GatewayType.PayPal, ipnTransaction.ParentTxnId);
if (parentTransaction == null)
{
_logger.LogWarning("Parent transaction was not found. " + ipnTransaction.TxnId);
return(new BadRequestResult());
}
var refundAmount = System.Math.Abs(ipnTransaction.McGross);
var remainingAmount = parentTransaction.Amount -
parentTransaction.RefundedAmount.GetValueOrDefault();
if (refundAmount > 0 && !parentTransaction.Refunded.GetValueOrDefault() &&
remainingAmount >= refundAmount)
{
parentTransaction.RefundedAmount =
parentTransaction.RefundedAmount.GetValueOrDefault() + refundAmount;
if (parentTransaction.RefundedAmount == parentTransaction.Amount)
{
parentTransaction.Refunded = true;
}
await _transactionRepository.ReplaceAsync(parentTransaction);
await _transactionRepository.CreateAsync(new Transaction
{
Amount = refundAmount,
CreationDate = ipnTransaction.PaymentDate,
OrganizationId = ids.Item1,
UserId = ids.Item2,
Type = TransactionType.Refund,
Gateway = GatewayType.PayPal,
GatewayId = ipnTransaction.TxnId,
PaymentMethodType = PaymentMethodType.PayPal,
Details = ipnTransaction.TxnId
});
}
}
return(new OkResult());
}
public async Task <IActionResult> PostIpn([FromQuery] string key)
{
if (key != _billingSettings.PayPal.WebhookKey)
{
return(new BadRequestResult());
}
if (HttpContext?.Request == null)
{
return(new BadRequestResult());
}
string body = null;
using (var reader = new StreamReader(HttpContext.Request.Body, Encoding.UTF8))
{
body = await reader.ReadToEndAsync();
}
if (string.IsNullOrWhiteSpace(body))
{
return(new BadRequestResult());
}
var verified = await _paypalIpnClient.VerifyIpnAsync(body);
if (!verified)
{
return(new BadRequestResult());
}
var ipnTransaction = new PayPalIpnClient.IpnTransaction(body);
if (ipnTransaction.ReceiverId != _billingSettings.PayPal.BusinessId || ipnTransaction.McCurrency != "USD")
{
return(new BadRequestResult());
}
var ids = ipnTransaction.GetIdsFromCustom();
if (!ids.Item1.HasValue && !ids.Item2.HasValue)
{
return(new OkResult());
}
// Only processing credits via IPN for now
if (!ipnTransaction.IsAccountCredit())
{
return(new OkResult());
}
if (ipnTransaction.PaymentStatus == "Completed")
{
var transaction = await _transactionRepository.GetByGatewayIdAsync(
GatewayType.PayPal, ipnTransaction.TxnId);
if (transaction == null)
{
try
{
var tx = new Transaction
{
Amount = ipnTransaction.McGross,
CreationDate = ipnTransaction.PaymentDate,
OrganizationId = ids.Item1,
UserId = ids.Item2,
Type = TransactionType.Charge,
Gateway = GatewayType.PayPal,
GatewayId = ipnTransaction.TxnId,
PaymentMethodType = PaymentMethodType.PayPal,
Details = ipnTransaction.TxnId
};
await _transactionRepository.CreateAsync(tx);
if (ipnTransaction.IsAccountCredit())
{
if (tx.OrganizationId.HasValue)
{
var org = await _organizationRepository.GetByIdAsync(tx.OrganizationId.Value);
if (org != null)
{
if (await _paymentService.CreditAccountAsync(org, tx.Amount))
{
await _organizationRepository.ReplaceAsync(org);
}
}
}
else
{
var user = await _userRepository.GetByIdAsync(tx.UserId.Value);
if (user != null)
{
if (await _paymentService.CreditAccountAsync(user, tx.Amount))
{
await _userRepository.ReplaceAsync(user);
}
}
}
// TODO: Send email about credit added?
}
}
// Catch foreign key violations because user/org could have been deleted.
catch (SqlException e) when(e.Number == 547)
{
}
}
}
else if (ipnTransaction.PaymentStatus == "Refunded")
{
var refundTransaction = await _transactionRepository.GetByGatewayIdAsync(
GatewayType.PayPal, ipnTransaction.TxnId);
if (refundTransaction == null)
{
var parentTransaction = await _transactionRepository.GetByGatewayIdAsync(
GatewayType.PayPal, ipnTransaction.ParentTxnId);
if (parentTransaction == null)
{
return(new BadRequestResult());
}
var refundAmount = System.Math.Abs(ipnTransaction.McGross);
var remainingAmount = parentTransaction.Amount -
parentTransaction.RefundedAmount.GetValueOrDefault();
if (refundAmount > 0 && !parentTransaction.Refunded.GetValueOrDefault() &&
remainingAmount >= refundAmount)
{
parentTransaction.RefundedAmount =
parentTransaction.RefundedAmount.GetValueOrDefault() + refundAmount;
if (parentTransaction.RefundedAmount == parentTransaction.Amount)
{
parentTransaction.Refunded = true;
}
await _transactionRepository.ReplaceAsync(parentTransaction);
await _transactionRepository.CreateAsync(new Transaction
{
Amount = ipnTransaction.McGross,
CreationDate = ipnTransaction.PaymentDate,
OrganizationId = ids.Item1,
UserId = ids.Item2,
Type = TransactionType.Refund,
Gateway = GatewayType.PayPal,
GatewayId = ipnTransaction.TxnId,
PaymentMethodType = PaymentMethodType.PayPal,
Details = ipnTransaction.TxnId
});
}
}
}
return(new OkResult());
}
