add types and axios

epaymentv2/initiatePayment.ts

@@ -0,0 +1,119 @@
+import { khaltiInstanceServer } from "./khaltiInstanceServer";
+import { awTry } from "./utils";
+
+/**
+ * Represents the successful response when initiating a payment.
+ */
+interface InitiatePaymentResponse {
+  /**
+   * A unique request identifier provided upon success. Use this 'pidx'
+   * for future references to this payment.
+   */
+  pidx: string;
+
+  /** The URL to redirect the user to in order to complete the payment. */
+  payment_url: string;
+
+  /** Date and time (likely in ISO format) when the payment link expires. */
+  expires_at: string;
+
+  /** Number of seconds until the payment link expires. */
+  expires_in: number;
+}
+
+/**
+ * Represents an error response when initiating a payment.
+ */
+interface InitiatePaymentError {
+  /** The return URL that was likely invalid or problematic. */
+  return_url: string[];
+
+  /** A fixed error key indicating a validation issue. */
+  error_key: "validation_error";
+}
+
+/**
+ * Represents the request payload for initiating a payment.
+ */
+interface InitiatePaymentRequest {
+  /** URL where the user will be redirected after completing the transaction */
+  return_url: string;
+
+  /** The main website URL associated with the transaction */
+  website_url: string;
+
+  /** Total amount of the transaction (in Paisa) */
+  amount: number;
+
+  /** Unique identifier for the purchase order */
+  purchase_order_id: string;
+
+  /** Descriptive name of the purchase order */
+  purchase_order_name: string;
+
+  /** Customer's billing information (optional) */
+  customer_info?: CustomerInfo;
+
+  /** Detailed breakdown of the total amount (e.g., taxes, fees) (optional) */
+  amount_breakdown?: AmountBreakdownItem[];
+
+  /** Details about the products or services included in the transaction (optional) */
+  product_details?: ProductDetail[];
+}
+
+/**
+ * Contains customer information for billing purposes.
+ */
+interface CustomerInfo {
+  /** Customer's full name */
+  name: string;
+
+  /** Customer's email address */
+  email: string;
+
+  /** Customer's contact phone number */
+  phone: string;
+}
+
+/**
+ * Represents a single charge item within the amount breakdown.
+ */
+interface AmountBreakdownItem {
+  /** Description of a particular charge within the total amount */
+  label: string;
+
+  /** Amount (in Paisa) associated with the label */
+  amount: number;
+}
+
+/**
+ * Holds information about a product included in the transaction.
+ */
+interface ProductDetail {
+  /** Unique identifier for the product */
+  identity: string;
+
+  /** Name or description of the product */
+  name: string;
+
+  /** Total price for this product (including quantity) */
+  total_price: number;
+
+  /** Number of units of this product purchased */
+  quantity: number;
+
+  /** Price per single unit of this product */
+  unit_price: number;
+}
+
+const initiatePayment = async (payload: InitiatePaymentRequest) => {
+  const [response, error] = await awTry<{ data: InitiatePaymentResponse }>(
+    khaltiInstanceServer.post("/epayment/initiate/", payload)
+  );
+  if (error) {
+    console.log("Error, in initiatePayment: ", error);
+  }
+  return response.data;
+};
+
+export { initiatePayment };

epaymentv2/khaltiInstanceServer.ts

@@ -0,0 +1,10 @@
+import axios from "axios";
+
+export const khaltiInstanceServer = axios.create({
+  baseURL: "https://a.khalti.com/api/v2",
+  headers: {
+    "Content-Type": "application/json",
+    Authorization: `Key f79110302bbf46828fca3a7b7514da97`, // live secret key
+  },
+  responseType: "json",
+});

epaymentv2/paymentLookup.ts

@@ -0,0 +1,93 @@
+/**
+ * Represents the possible statuses of a payment transaction.
+ */
+type PaymentStatus =
+  | "Completed"
+  | "Pending"
+  | "Refunded"
+  | "Expired"
+  | "UserCanceled"
+  | "PartiallyRefunded"
+  | "Initiated";
+
+/**
+ * Represents the request payload for the payment lookup API.
+ */
+interface PaymentLookupRequest {
+  /** The initial payment identifier. */
+  pidx: string;
+}
+
+/**
+ * Represents the base structure of a successful lookup API response.
+ */
+interface PaymentLookupSuccessResponse {
+  /** The initial payment identifier. */
+  pidx: string;
+
+  /** The total amount of the transaction (in what currency? Assuming Paisa here). */
+  total_amount: number;
+
+  /** The current status of the transaction. */
+  status: PaymentStatus;
+
+  /** The unique transaction identifier assigned by Khalti. */
+  transaction_id: string | null;
+
+  /** The fee associated with the transaction. */
+  fee: number;
+
+  /** Indicates whether the transaction has been refunded. */
+  refunded: boolean;
+}
+
+/**
+ * Represents a specific lookup response for a 'Pending' transaction.
+ */
+interface PaymentLookupPendingResponse extends PaymentLookupSuccessResponse {
+  status: "Pending"; // Enforce the specific status
+  transaction_id: null; // Transaction ID not yet generated
+}
+
+/**
+ * Represents a specific lookup response for an 'Initiated' transaction.
+ */
+interface PaymentLookupInitiatedResponse extends PaymentLookupSuccessResponse {
+  status: "Initiated";
+}
+
+/**
+ * Represents a specific lookup response for a 'Refunded' transaction.
+ */
+interface PaymentLookupRefundedResponse extends PaymentLookupSuccessResponse {
+  status: "Refunded";
+  refunded: true;
+}
+
+/**
+ * Represents a specific lookup response for an 'Expired' transaction.
+ */
+interface PaymentLookupExpiredResponse extends PaymentLookupSuccessResponse {
+  status: "Expired";
+  transaction_id: null;
+}
+
+/**
+ * Represents a specific lookup response for a 'UserCanceled' transaction.
+ */
+interface PaymentLookupCanceledResponse extends PaymentLookupSuccessResponse {
+  status: "UserCanceled";
+  transaction_id: null;
+}
+
+// Completed	- Provide service to user.
+// Pending	- Hold, do not provide service. And contact Khalti team.
+// Refunded	- Transaction has been refunded to user. Do not provide service.
+// Expired	- User have not made the payment, Do not provide the service.
+// User canceled	User have canceled the payment, Do not provide the service.
+
+// Only the status with Completed must be treated as success.
+// Status Canceled , Expired , Failed must be treated as failed.
+// If any negative consequences occur due to incomplete API integration or providing service without checking lookup status, Khalti won’t be accountable for any such losses.
+// For status other than these, hold the transaction and contact KHALTI team.
+// Payment link expires in 60 minutes in production.

epaymentv2/paymentSuccessCallback.ts

@@ -0,0 +1,63 @@
+/**
+ * Represents the data received in the redirect callback URL after a payment attempt.
+ */
+interface PaymentRedirectResponse {
+  /** The initial payment identifier provided during initiation. */
+  pidx: string;
+
+  /**
+   * The current status of the transaction.
+   * - "Completed": Payment completed successfully.
+   * - "Pending": Payment in progress. Use the Lookup API for final confirmation.
+   * - "UserCanceled": The user canceled the payment process.
+   */
+  status: "Completed" | "Pending" | "UserCanceled";
+
+  /** The unique transaction identifier assigned by Khalti. */
+  transaction_id: string;
+
+  /** (Synonym for transaction_id) - The unique transaction identifier assigned by Khalti.  */
+  tidx: string;
+
+  /** The total amount paid by the user (in Paisa). */
+  amount: number;
+
+  /** The payer's Khalti ID. */
+  mobile: string;
+
+  /** The unique purchase order ID provided when initiating the payment. */
+  purchase_order_id: string;
+
+  /** The name associated with the purchase order. */
+  purchase_order_name: string;
+
+  /** (Synonym for amount) - The total amount paid by the user (in Paisa). */
+  total_amount: number;
+}
+
+// It's recommended that during implementation, payment lookup API is checked for confirmation after the redirect callback is received
+
+// Success transaction callback
+
+// http://example.com/?pidx=bZQLD9wRVWo4CdESSfuSsB
+// &txnId=4H7AhoXDJWg5WjrcPT9ixW
+// &amount=1000
+// &total_amount=1000
+// &status=Completed
+// &mobile=98XXXXX904
+// &tidx=4H7AhoXDJWg5WjrcPT9ixW
+// &purchase_order_id=test12
+// &purchase_order_name=test
+// &transaction_id=4H7AhoXDJWg5WjrcPT9ixW
+
+// Canceled transaction callback
+
+// http://example.com/?pidx=bZQLD9wRVWo4CdESSfuSsB
+// &transaction_id=
+// &tidx=
+// &amount=1000
+// &total_amount=1000
+// &mobile=
+// &status=User canceled
+// &purchase_order_id=test12
+// &purchase_order_name=test

epaymentv2/utils.ts

@@ -0,0 +1,9 @@
+export async function awTry<T>(promise: unknown) {
+  try {
+    const data = await promise;
+    return [data, null] as [T, never];
+  } catch (err) {
+    console.error(err);
+    return [null, err] as [never, unknown];
+  }
+}

package.json

@@ -13,5 +13,8 @@
     "@changesets/cli": "^2.27.1",
     "tsup": "^8.0.2",
     "typescript": "^5.4.3"
+  },
+  "dependencies": {
+    "axios": "^1.6.8"
   }
 }