Create Order

curl --request POST \
  --url https://api-pacb-uat.eximpe.com/pg/orders/ \
  --header 'Content-Type: application/json' \
  --header 'X-Client-ID: <api-key>' \
  --header 'X-Client-Secret: <api-key>' \
  --data '
{
  "amount": "1000.00",
  "currency": "INR",
  "reference_id": "ORDER-123456",
  "collection_mode": "hosted_payment",
  "mop_type": "upi",
  "return_url": "https://yourdomain.com/payment/callback/",
  "business_model": "B2C",
  "buyer": {
    "name": "Alice Smith",
    "email": "[email protected]",
    "phone": "+919812345678",
    "address": {
      "line_1": "221B Baker Street",
      "city": "Mumbai",
      "state": "Maharashtra",
      "postal_code": "400001"
    }
  },
  "product": {
    "name": "Wireless Headphones",
    "description": "Premium noise-cancelling wireless headphones",
    "hs_code": "85183000",
    "hs_code_description": "Headphones and earphones, whether or not combined with a microphone",
    "type_of_goods": "physical_goods"
  },
  "invoice": {
    "number": "INV-2026-0001",
    "date": "2026-09-21"
  }
}
'

{
  "success": true,
  "message": "Checkout session created successfully",
  "data": {
    "session_id": "b4db5e1c82db8636094f54e3293218172ae2ab87dee6ce4e97c82db6c63f243a",
    "order_id": "OD5916184980"
  }
}

POST

orders

curl --request POST \
  --url https://api-pacb-uat.eximpe.com/pg/orders/ \
  --header 'Content-Type: application/json' \
  --header 'X-Client-ID: <api-key>' \
  --header 'X-Client-Secret: <api-key>' \
  --data '
{
  "amount": "1000.00",
  "currency": "INR",
  "reference_id": "ORDER-123456",
  "collection_mode": "hosted_payment",
  "mop_type": "upi",
  "return_url": "https://yourdomain.com/payment/callback/",
  "business_model": "B2C",
  "buyer": {
    "name": "Alice Smith",
    "email": "[email protected]",
    "phone": "+919812345678",
    "address": {
      "line_1": "221B Baker Street",
      "city": "Mumbai",
      "state": "Maharashtra",
      "postal_code": "400001"
    }
  },
  "product": {
    "name": "Wireless Headphones",
    "description": "Premium noise-cancelling wireless headphones",
    "hs_code": "85183000",
    "hs_code_description": "Headphones and earphones, whether or not combined with a microphone",
    "type_of_goods": "physical_goods"
  },
  "invoice": {
    "number": "INV-2026-0001",
    "date": "2026-09-21"
  }
}
'

{
  "success": true,
  "message": "Checkout session created successfully",
  "data": {
    "session_id": "b4db5e1c82db8636094f54e3293218172ae2ab87dee6ce4e97c82db6c63f243a",
    "order_id": "OD5916184980"
  }
}

Overview

Create Order is the first step in the payment flow. You send the buyer, product and invoice details from your backend, and choose how the payment is collected with collection_mode:

Hosted Checkout (hosted_payment) returns a session_id. You hand it to the EximPe JS SDK, which opens EximPe’s payment page.
S2S UPI Intent (s2s) returns an intent_uri that you use to open the customer’s UPI app.

Both return an order_id. A successful create returns 201 Created.

Environment	Base URL
Sandbox	`https://api-pacb-uat.eximpe.com`
Production	`https://api-pacb.eximpe.com`

Headers

Header	Required	Value
`X-Client-ID`	Yes	Your Client ID, from Developer Settings in the merchant dashboard.
`X-Client-Secret`	Yes	Your Client Secret. Keep it on your server.
`X-API-Version`	Recommended	`3.0.0`. It selects the API version; it is not a credential.
`X-Merchant-ID`	PSPs only	The sub-merchant the order is for. Required when you authenticate as a PSP; merchants using their own credentials leave it out.
`Content-Type`	Yes	`application/json`

Create orders from your backend only. The request carries your Client Secret, so never send it from a browser or a mobile app.

Hosted Checkout and S2S UPI Intent

	Hosted Checkout	S2S UPI Intent
`collection_mode`	`hosted_payment`	`s2s`
`mop_type`	Optional. Pre-selects a payment method on the payment page	Must be `upi`
`upi_flow_type`	Not used	Must be `intent`
`buyer.ip_address`, `buyer.user_agent`	Not used; EximPe captures them on the payment page	Required
`return_url`	Optional. Where the customer lands after paying	Not used; the customer is not redirected
Returns	`order_id`, `session_id`	`order_id`, `intent_uri`, `expires_at`

collection_mode has no default. Leave it out, or send another value, and the request is refused with {"collection_mode": "Invalid collection mode"}. S2S UPI Intent must be enabled on your account. See the S2S UPI Intent integration guide for the end-to-end flow.

Request Parameters

Fields not listed as required are optional. “Conditional” means the field is required only in the stated case.

Top-level

Name	Type	Required	Description	Constraints
amount	string	Yes	Amount to collect, in rupees.	Decimal string such as `"1000.00"`; a JSON number is also accepted. More than two decimal places are rounded to two — `1000.456` is charged as `1000.46`. Greater than 0 and at most 10,000,000.00
currency	string	Yes	ISO 4217 currency code.	`INR`
reference_id	string	Yes	Your reference for the order.	1–50 chars; letters, numbers and hyphens only (`ORDER-123456`, not `ORDER_123456`); unique across your orders. See Duplicate requests
collection_mode	string	Yes	How the payment is collected.	`hosted_payment` or `s2s`; no default
mop_type	string	Conditional	Payment method.	Hosted Checkout: optional, one of `credit_card`, `debit_card`, `upi`, `net_banking`, `qr`. S2S UPI Intent: required, `upi`
upi_flow_type	string	Conditional	UPI flow.	S2S UPI Intent: required, `intent`
return_url	string	No	Where Hosted Checkout sends the customer when the payment finishes, whatever the outcome.	Absolute URL, max 500 chars. Without it the customer sees EximPe’s own result page
business_model	string	No	Whether the buyer is a business or a consumer.	`B2B` or `B2C`, uppercase; derived from your KYC when omitted
purpose_code	string	No	FEMA/FETERS purpose code the order settles under.	Must be active and enabled on your account (e.g. `S0802`); derived from your KYC when omitted
buyer	object	Yes	The buyer.	See Buyer
product	object	Yes	What is being sold.	See Product
invoice	object	Yes	Invoice metadata.	See Invoice

When you omit purpose_code, it is filled in only if your account has exactly one allowed code; otherwise it is left unset for later classification. Neither business_model nor purpose_code is returned by Create Order, and neither can be changed after the order is created. Read them back with Get Order Details.

Buyer

Name	Type	Required	Description	Constraints
name	string	Yes	Full name.	Max 255 chars
email	string	Yes	Email address.	A valid email address
phone	string	Yes	Phone number with country code.	E.164: `+`, the country code, then the number, e.g. `+919812345678`; `9812345678` is refused
address	object	Yes	Address.	See Address
ip_address	string	Conditional	The customer’s IP address.	S2S UPI Intent: required. IPv4 or IPv6
user_agent	string	Conditional	The customer’s browser user agent.	S2S UPI Intent: required

Address (buyer.address)

Name	Type	Required	Description	Constraints
line_1	string	No	Address line 1.
line_2	string	No	Address line 2.
city	string	No	City.	Max 255 chars
state	string	No	State.	Max 255 chars
postal_code	string	Yes	PIN code.	A valid 6-digit Indian PIN code

Product

Name	Type	Required	Description	Constraints
name	string	Yes	Product or service name.
description	string	No	Description.	Max 1024 chars
type_of_goods	string	Yes	Nature of what is sold.	`physical_goods`, `digital_goods` or `service`
hs_code	string	Conditional	8-digit HS code.	Required for `physical_goods`; must be a known HS code
hs_code_description	string	No	HS code description.

Invoice

Name	Type	Required	Description	Constraints
number	string	Yes	Invoice number.	Max 255 chars. Letters, numbers, spaces and `. , ' - / & _ ( ) : ; ! @ # $ % * + = < > [ ] { } \| ~` — unlike `reference_id`, underscores are allowed. Unique across your orders that have not failed
date	string	No	Invoice date.	`YYYY-MM-DD`

Examples

{
  "amount": "1000.00",
  "currency": "INR",
  "reference_id": "ORDER-123456",
  "collection_mode": "hosted_payment",
  "mop_type": "upi",
  "return_url": "https://yourdomain.com/payment/callback/",
  "business_model": "B2C",
  "buyer": {
    "name": "Alice Smith",
    "email": "[email protected]",
    "phone": "+919812345678",
    "address": {
      "line_1": "221B Baker Street",
      "city": "Mumbai",
      "state": "Maharashtra",
      "postal_code": "400001"
    }
  },
  "product": {
    "name": "Wireless Headphones",
    "description": "Premium noise-cancelling wireless headphones",
    "hs_code": "85183000",
    "hs_code_description": "Headphones and earphones, whether or not combined with a microphone",
    "type_of_goods": "physical_goods"
  },
  "invoice": {
    "number": "INV-2026-0001",
    "date": "2026-09-21"
  }
}

{
  "amount": "1000.00",
  "currency": "INR",
  "reference_id": "ORDER-123457",
  "collection_mode": "s2s",
  "mop_type": "upi",
  "upi_flow_type": "intent",
  "buyer": {
    "name": "John Doe",
    "email": "[email protected]",
    "phone": "+919876543210",
    "address": {
      "line_1": "123 Main Street",
      "city": "Delhi",
      "state": "Delhi",
      "postal_code": "110001"
    },
    "ip_address": "203.0.113.10",
    "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36"
  },
  "product": {
    "name": "Smartphone",
    "description": "This is a sample product description",
    "hs_code": "85171290",
    "hs_code_description": "Telephones for cellular networks, other than smartphones",
    "type_of_goods": "physical_goods"
  },
  "invoice": {
    "number": "INV-2026-0002",
    "date": "2026-09-21"
  }
}

Response

A successful create returns 201 Created.

Hosted Checkout

order_id: The order’s ID
session_id: A 64-character hex string. Pass it to the EximPe JS SDK to open the payment page

The session_id is valid for 15 minutes. After that, create a new order to get a fresh one. An expired or already-completed session returns Invalid or expired session.

S2S UPI Intent

order_id: The order’s ID
intent_uri: The UPI payment request to open the customer’s UPI app with. See Invoking the intent
expires_at: When the intent stops accepting payment, in UTC — 5 minutes after creation
test_simulator_url: Sandbox only. Open it in a browser to complete the payment without a real UPI app; the result follows the test VPA you use in the simulator. Not returned in production

Sandbox responses may carry other testing fields. Ignore any field not listed here.

Invoking the intent

Depending on how your account collects UPI, intent_uri comes either as a complete URI (upi://pay?pa=...) or as its query string alone (pa=...&pn=...). Handle both: if it does not start with upi://, prefix it with upi://pay? before invoking it, and never add a second scheme. See the integration guide for Android, iOS and desktop handling.

{
  "success": true,
  "message": "Checkout session created successfully",
  "data": {
    "session_id": "b4db5e1c82db8636094f54e3293218172ae2ab87dee6ce4e97c82db6c63f243a",
    "order_id": "OD5916184980"
  }
}

{
  "success": true,
  "message": "S2S UPI Request created successfully",
  "data": {
    "intent_uri": "upi://pay?pa=merchant.sandbox@examplebank&pn=Example%20Merchant&am=1000.00&cu=INR&tn=OD2000992103&tr=403993715534292371",
    "order_id": "OD2000992103",
    "expires_at": "2026-09-21T10:35:00.156967Z"
  }
}

{
  "success": true,
  "message": "S2S UPI Request created successfully",
  "data": {
    "intent_uri": "upi://pay?pa=merchant.sandbox@examplebank&pn=Example%20Merchant&am=1000.00&cu=INR&tn=OD2000992103&tr=403993715534292371",
    "order_id": "OD2000992103",
    "expires_at": "2026-09-21T10:35:00.156967Z",
    "test_simulator_url": "<simulator URL returned by the sandbox API>"
  }
}

Errors

Refusals use the standard envelope: success is false, and error carries a code, a message and details. A 400 always carries ERR_ORDER_002 — read details to see what failed and fix that field before retrying.

Status	`error.code`	When	`details`
`400`	`ERR_ORDER_002`	A field is missing or invalid	Keyed by field and nested like the request, one message per field, e.g. `{"buyer": {"phone": "Enter a valid phone number."}}`
`400`	`ERR_ORDER_002`	`reference_id` has a character other than a letter, number or hyphen	`{"reference_id": "Invalid input: ORDER_123456"}`
`400`	`ERR_ORDER_002`	`reference_id` is already used by one of your orders	`{"reference_id": "Reference ID already exists"}`
`400`	`ERR_ORDER_002`	`invoice.number` is already used by one of your orders that has not failed	`{"invoice": {"number": "Invoice Number already exists"}}`
`400`	`ERR_ORDER_002`	`collection_mode` is missing or unrecognised	`{"collection_mode": "Invalid collection mode"}`
`400`	`ERR_ORDER_002`	`business_model` is not `B2B` or `B2C`	`{"business_model": "\"b2b\" is not a valid choice."}`
`400`	`ERR_ORDER_002`	`purpose_code` is unknown or inactive	`{"purpose_code": "Invalid Purpose code given."}`
`400`	`ERR_ORDER_002`	`purpose_code` is valid but not enabled on your account	`{"purpose_code": "Purpose code is not enabled for this merchant."}`
`400`	`ERR_ORDER_002`	`amount` is 0 or less, or above 10,000,000.00	`{"total_amount": "Total amount must be greater than 0"}` or `{"total_amount": "Total amount must be less than or equal to 10,000,000"}`
`401`	`ERR_AUTH_000`	`X-Client-ID` or `X-Client-Secret` is missing	`{"authentication": "Missing credentials."}`
`401`	`ERR_AUTH_001`	The credentials are wrong	`{"authentication": "Invalid credentials."}`
`401`	`ERR_AUTH_000`	A PSP left out `X-Merchant-ID`	`{"authentication": "X-Merchant-ID header is required for this endpoint."}`
`401`	`ERR_AUTH_001`	`X-Merchant-ID` is not one of your active sub-merchants	`{"authentication": "Invalid X-Merchant-ID provided."}`
`403`	`ERR_MERCHANT_ACCOUNT_002`	Your merchant account is not active	`{"authentication": "Merchant account is inactive."}`
`403`	—	S2S payments are not enabled on your account	Not the standard envelope: `{"detail": "You do not have permission to perform this action."}`
`500`	`ERR_SERVICE_ERROR_000`	Anything unexpected	`{"error": "An unexpected error occurred. Please try again later"}`

Duplicate reference_id

{
  "success": false,
  "error": {
    "code": "ERR_ORDER_002",
    "message": "Validation error",
    "details": {
      "reference_id": "Reference ID already exists"
    }
  }
}

Duplicate requests

reference_id is single-use. It must be unique across all your orders, whatever their status — a failed order still holds its reference_id. Sending one that is already used is refused with Reference ID already exists; the original order is not returned.
invoice.number is unique across your orders that have not failed. Once an order fails, its invoice number can be used again.
For a PSP, both rules apply per sub-merchant.

After creating the order

Hosted Checkout. Load the EximPe JS SDK on your page and call eximpe.checkout({ sessionId }) within 15 minutes. The customer is sent to your return_url whether the payment succeeds, fails or is cancelled.
S2S UPI Intent. Invoke the intent_uri on the customer’s device before expires_at.
Confirm the outcome from your backend. Never trust the redirect or the UPI app alone: check the Order Status API or wait for the Payment Successful webhook.

Integration guides: Hosted Checkout · S2S UPI Intent

Authorizations

X-Client-ID

string

header

required

Client Application ID - Your unique application identifier used to authenticate API requests. You can find your Client ID in the Developer Settings section of the merchant dashboard.

X-Client-Secret

string

header

required

Client Secret Key - Your secret key used alongside the Client ID for secure authentication. Keep this confidential and never expose it in client-side code. Available in the Developer Settings section of the merchant dashboard.

Headers

X-API-Version

enum<string>

default:3.0.0

The API version you integrate against. Send 3.0.0 for v3. It is a version selector, not a credential.

Available options:

3.0.0

Body

application/json

Order creation request

amount

string

required

Amount in rupees, as a decimal string such as "1000.00". A JSON number is also accepted. More than two decimal places are rounded to two, so 1000.456 is charged as 1000.46. Must be greater than 0 and at most 10,000,000.00.

Example:

"1000.00"

currency

enum<string>

required

ISO 4217 currency code. Hosted Checkout and S2S UPI Intent collect in INR only.

Available options:

INR

reference_id

string

required

Your reference for the order: letters, numbers and hyphens only. Must be unique across your orders, including failed ones.

Required string length: 1 - 50

Pattern: ^[A-Za-z0-9-]+$

Example:

"ORDER-123456"

collection_mode

enum<string>

required

Mode of payment collection. Required — there is no server-side default.

Available options:

hosted_payment,

s2s

buyer

object

required

Show child attributes

product

object

required

Show child attributes

invoice

object

required

Show child attributes

return_url

string<uri>

Optional. Where Hosted Checkout sends the customer when the payment finishes. Without it the customer sees EximPe's own result page. S2S UPI Intent does not redirect the customer.

Maximum string length: 500

mop_type

enum<string>

Hosted Checkout: optional, pre-selects a payment method on the payment page. S2S UPI Intent: must be upi.

Available options:

credit_card,

debit_card,

upi,

net_banking,

qr

upi_flow_type

enum<string>

Required for S2S UPI Intent, where it must be intent. Not used by Hosted Checkout.

Available options:

intent

business_model

enum<string>

Whether the buyer is a business (B2B) or a consumer (B2C). Optional — derived from the merchant's KYC when omitted.

Available options:

B2B,

B2C

purpose_code

string

FEMA/FETERS purpose code this order settles under (e.g. S0802). Optional — derived from the merchant's allowed purpose codes when omitted and exactly one is allowed.

Example:

"S0802"

Response

Order created

success

boolean

required

Indicates if the request was successful

message

string

required

Response message

data

object

required

Show child attributes

Order

Payment

Merchant

Settlement

Refund

Subscriptions

Payment Links

Virtual Bank Accounts

LRS

B2B Services

Webhooks

Overview

Headers

Hosted Checkout and S2S UPI Intent

Request Parameters

Top-level

Buyer

Address (buyer.address)

Product

Invoice

Examples

Response

Hosted Checkout

S2S UPI Intent

Invoking the intent

Errors

Duplicate requests

After creating the order

Authorizations

Headers

Body

Response

​Overview

​Headers

​Hosted Checkout and S2S UPI Intent

​Request Parameters

​Top-level

​Buyer

​Address (buyer.address)

​Product

​Invoice

​Examples

​Response

​Hosted Checkout

​S2S UPI Intent

​Invoking the intent

​Errors

​Duplicate requests

​After creating the order

Authorizations

Headers

Body

Response

Overview

Headers

Hosted Checkout and S2S UPI Intent

Request Parameters

Top-level

Buyer

Address (buyer.address)

Product

Invoice

Examples

Response

Hosted Checkout

S2S UPI Intent

Invoking the intent

Errors

Duplicate requests

After creating the order