CyberSource

CyberSource Secure Acceptance is a hosted checkout for card payments, in MMK or any other currency.

Call	What it does	Returns
cs.Initiate(data)	Signed form posted to the hosted checkout	*FormPayment
cs.HandleCallback(request)	Verify the result post	*PaymentCallback

CyberSource has no status API in this package: the callback is the only payment result.

Responses shows what CyberSource puts in each result.

How it works

CyberSource posts the result twice, to your backoffice URL and through the browser to your receipt page, and both are verified the same way.

CyberSource: signed form, hosted checkout, two result posts

Initiating a Payment

import (
	"fmt"
	"io"

	myanmarpayments "github.com/laranex/go-myanmar-payments/v4"
	"github.com/laranex/go-myanmar-payments/v4/cybersource"
)

cs, err := cybersource.New(cybersource.Config{
	ProfileID: "...",
	AccessKey: "...",
	SecretKey: "...",
})
if err != nil {
	return err
}

data := cybersource.PaymentData{
	OrderID:         fmt.Sprintf("ORDER_%d", order.ID),
	Amount:          myanmarpayments.Kyat(10000),
	CallbackURL:     "https://shop.test/payments/cybersource/callback",
	Currency:        "MMK",
	TransactionType: cybersource.Sale,
	Locale:          "en-us",
	ReturnURL:       "https://shop.test/payments/cybersource/receipt",
	CancelURL:       "https://shop.test/checkout",
}

payment, err := cs.Initiate(data)
if err != nil {
	return err
}

// The page posts the signed form to CyberSource on load.
w.Header().Set("Content-Type", "text/html; charset=utf-8")
io.WriteString(w, payment.HTML())

cybersource.PaymentData

Field	Type	Required	Rules
OrderID	string	Yes	At most 50 characters, sent as reference_number
Amount	myanmarpayments.Amount	Yes	Order total in Currency, 0 or more, any number of decimals, at most 15 characters, e.g. Kyat(10000) or MustParseAmount("10.50")
CallbackURL	string	Yes	Absolute http or https URL CyberSource posts the result to. At most 255 characters; CyberSource may require HTTPS in production
Currency	string	Yes	Any three-letter uppercase ISO 4217 code, e.g. MMK
TransactionType	cybersource.TransactionType	Yes	cybersource.Sale ("sale"), .Authorization ("authorization"), .SaleAndCreateToken ("sale,create_payment_token") or .AuthorizationAndCreateToken ("authorization,create_payment_token")
Locale	string	Yes	Hosted page language as a CyberSource locale code, e.g. en-us
ReturnURL	string	No	Receipt page for the customer (absolute http or https URL). At most 255 characters
CancelURL	string	No	Page shown when the customer cancels (absolute http or https URL). At most 255 characters

Amounts and Currencies

CyberSource is multi-currency and accepts decimals. For another currency, pass an Amount with the currency: Amount: myanmarpayments.MustParseAmount("10.50"), Currency: "USD".

Form Encoding

CyberSource expects the form as application/x-www-form-urlencoded. payment.Enctype carries it; use it if you render the form yourself.

Handling Callbacks

CyberSource posts a form to CallbackURL. The same check works for the browser post to your receipt page.

import (
	"net/http"

	myanmarpayments "github.com/laranex/go-myanmar-payments/v4"
)

// POST /payments/cybersource/callback
request, err := myanmarpayments.NewCallbackRequestFromHTTP(r)
if err != nil {
	http.Error(w, "invalid callback", http.StatusBadRequest)
	return
}
callback, err := cs.HandleCallback(request)
if err != nil {
	http.Error(w, "invalid callback", http.StatusBadRequest)
	return
}

if callback.IsSuccessful() {
	// callback.OrderID is your req_reference_number
	// callback.GatewayReference is CyberSource's transaction_id
}

callback.Acknowledgement.Write(w)

Only signed fields are trusted: decision and req_reference_number must be listed in signed_field_names, transaction_id and the amount are read only when they are signed, and Raw keeps only the signed fields plus signature. An unsigned extra field, such as decision=ACCEPT added to a re-posted checkout form, can't change the result.

Responses

What CyberSource puts in each field. See Results and PaymentCallback & Status for the full structs. On error the result is nil. A field the gateway didn't send is "". CyberSource posts form fields, so every Raw value is a string, exactly as sent.

Initiate() → *myanmarpayments.FormPayment

Field / Method	CyberSource value
Flow()	FlowForm
OrderID	Your data.OrderID
Action	{BaseURL}/pay, e.g. https://secureacceptance.cybersource.com/pay
Fields	The signed fields below, in signing order. Post them unchanged
Enctype	application/x-www-form-urlencoded
HTML()	A full HTML page that posts Fields to Action on load

Form field	Value
access_key	Config.AccessKey
profile_id	Config.ProfileID
transaction_uuid	A random ID, new for every call
signed_field_names	The field names in this table except signature, comma-separated
signed_date_time	UTC time, e.g. 2026-10-08T09:30:00Z
locale	data.Locale
transaction_type	data.TransactionType
reference_number	data.OrderID
amount	data.Amount, e.g. 10000
currency	data.Currency
override_custom_receipt_page	data.ReturnURL, "" when unset
override_backoffice_post_url	data.CallbackURL
override_custom_cancel_page	data.CancelURL, "" when unset
signature	Base64 HMAC-SHA256 of the signed fields

Initiate makes no HTTP call, so it takes no context and cybersource.New takes no HTTP client. FormPayment has no Raw: nothing is sent to CyberSource until the customer's browser posts the form.

HandleCallback() → *myanmarpayments.PaymentCallback

Field	CyberSource value
OrderID	CyberSource req_reference_number (your OrderID)
Status	decision mapped, see Statuses
GatewayStatus	CyberSource decision, trimmed and uppercased, e.g. ACCEPT
GatewayReference	CyberSource transaction_id. "" when it is not signed
Amount	CyberSource auth_amount, falling back to req_amount when it is missing or empty, e.g. 10000. Signed values only
Raw	The signed fields of the verified post plus signature, e.g. decision, reason_code, message, transaction_id, auth_amount, auth_code, req_reference_number, req_amount, req_currency, req_transaction_uuid, signed_field_names, signed_date_time. Unsigned fields are left out
Acknowledgement	HTTP 200, empty body, Content-Type: text/plain

Statuses

CyberSource decision	PaymentStatus
ACCEPT	StatusSuccessful
REVIEW	StatusPending
DECLINE, ERROR	StatusFailed
CANCEL	StatusCanceled
anything else	StatusUnknown

Errors

Call	Returns	When
Initiate()	*InvalidPaymentDataError	data.Validate() fails. Nothing is signed
HandleCallback()	*SignatureVerificationError	signature doesn't match, a field listed in signed_field_names is missing or holds an object or array, or decision or req_reference_number isn't signed

The error types live in the root myanmarpayments package. CyberSource makes no HTTP calls, so nothing returns *APIError.