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Event Overview

Event Type: PAYMENT_FAILED
Category: Payment
Description: Payment transaction has failed This webhook is triggered when a customer’s payment attempt fails through EximPe.

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Delivery Details

AttributeValue
HTTP methodPOST
URLThe webhook URL configured on your merchant account’s API credentials
Content-Typeapplication/json
Timeout10 seconds
RetriesUp to 5 delivery attempts (backoff: 1 min, 5 min, 15 min, 60 min)

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Headers

HeaderDescription
Content-Typeapplication/json
User-AgentEximpe-Webhook/1.0
X-Webhook-EventPAYMENT_FAILED
X-Webhook-TimestampUnix timestamp (string) at the time of the request
X-Webhook-SignatureHMAC-SHA256 signature of the request body (JSON string with keys sorted, no extra whitespace), using your API key as the secret. Hex-encoded.
Signature verification (recommended):
Compute HMAC-SHA256(encryption_key, raw_body) where raw_body is the exact UTF-8 request body as received. Compare the hex result with the X-Webhook-Signature header to ensure the webhook is from the platform and unchanged.

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Payload Schema

{
    "event_type": "PAYMENT_FAILED",
    "event_time": "2024-02-15 16:53:15Z",
    "version": "1.0",
    "sequence_number": "e40552bf-ed12-4f35-9a97-162d97e6fa34",
    "data": {
        "status": "failed",
        "message": "Cancelled by user",
        "mop_type": "upi",
        "order_id": "OD3376378679",
        "payment_id": "PR6938527534",
        "bank_ref_num": "OD3376378679-PR6938527534",
        "payment_completed_at": "2025-06-24T12:30:44.000000Z",
        "subscription": "SUB123456"
    }
}

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Field Specifications

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event_type
string
required
Always "PAYMENT_FAILED" for this webhook event
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event_time
string
required
Timestamp when the event occurred in ISO 8601 formatExample: "2024-02-15 16:53:15Z"
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version
string
required
Webhook payload version (currently “1.0”)
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sequence_number
string
required
Unique identifier for the event instanceExample: "e40552bf-ed12-4f35-9a97-162d97e6fa34"
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data
object
required
Event-specific data payload containing failed payment transaction details