Paystack Testing

Paystack Testing

Complete guide for testing Paystack integrations in test mode.

Depends on: paystack-setup for the paystackRequest helper.

Test Environment Setup

Environment Variables

# .env.test (or .env.local for development)
PAYSTACK_SECRET_KEY=sk_test_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
NEXT_PUBLIC_PAYSTACK_PUBLIC_KEY=pk_test_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Never commit real keys. Use sk_test_* / pk_test_* keys from your Paystack Dashboard → Settings → API Keys & Webhooks.

Test vs Live Mode

Test Card Numbers

Use these with the Paystack Popup or Charge API in test mode:

PIN, OTP, and other test values

Integration Tests with TypeScript

Transaction Flow Test

import { describe, it, expect, beforeAll } from "vitest";

const BASE_URL = "https://api.paystack.co";
const SECRET_KEY = process.env.PAYSTACK_SECRET_KEY!;

async function paystackRequest<T = any>(
  path: string,
  options: RequestInit = {}
): Promise<{ status: boolean; message: string; data: T }> {
  const res = await fetch(`${BASE_URL}${path}`, {
    ...options,
    headers: {
      Authorization: `Bearer ${SECRET_KEY}`,
      "Content-Type": "application/json",
      ...options.headers,
    },
  });
  return res.json();
}

describe("Paystack Transaction Flow", () => {
  let authorizationUrl: string;
  let reference: string;

  it("should initialize a transaction", async () => {
    const res = await paystackRequest<{
      authorization_url: string;
      access_code: string;
      reference: string;
    }>("/transaction/initialize", {
      method: "POST",
      body: JSON.stringify({
        email: "test@example.com",
        amount: 50000, // ₦500
        callback_url: "https://example.com/callback",
      }),
    });

    expect(res.status).toBe(true);
    expect(res.data.authorization_url).toContain("paystack.com");
    expect(res.data.reference).toBeTruthy();
    authorizationUrl = res.data.authorization_url;
    reference = res.data.reference;
  });

  it("should verify transaction (pending before payment)", async () => {
    const res = await paystackRequest(`/transaction/verify/${reference}`);
    // In test mode without completing payment, status may be "abandoned"
    expect(res.status).toBe(true);
  });

  it("should list transactions", async () => {
    const res = await paystackRequest("/transaction?perPage=5");
    expect(res.status).toBe(true);
    expect(Array.isArray(res.data)).toBe(true);
  });
});

Customer API Tests

describe("Paystack Customers", () => {
  let customerCode: string;

  it("should create a customer", async () => {
    const res = await paystackRequest<{
      customer_code: string;
      email: string;
    }>("/customer", {
      method: "POST",
      body: JSON.stringify({
        email: `test-${Date.now()}@example.com`,
        first_name: "Test",
        last_name: "User",
      }),
    });

    expect(res.status).toBe(true);
    expect(res.data.customer_code).toMatch(/^CUS_/);
    customerCode = res.data.customer_code;
  });

  it("should fetch the customer", async () => {
    const res = await paystackRequest(`/customer/${customerCode}`);
    expect(res.status).toBe(true);
    expect(res.data.customer_code).toBe(customerCode);
  });
});

Plan + Subscription Tests

describe("Paystack Plans", () => {
  let planCode: string;

  it("should create a plan", async () => {
    const res = await paystackRequest<{ plan_code: string }>("/plan", {
      method: "POST",
      body: JSON.stringify({
        name: `Test Plan ${Date.now()}`,
        interval: "monthly",
        amount: 100000, // ₦1,000
      }),
    });

    expect(res.status).toBe(true);
    expect(res.data.plan_code).toMatch(/^PLN_/);
    planCode = res.data.plan_code;
  });

  it("should list plans", async () => {
    const res = await paystackRequest("/plan?perPage=5");
    expect(res.status).toBe(true);
  });

  it("should fetch the plan", async () => {
    const res = await paystackRequest(`/plan/${planCode}`);
    expect(res.status).toBe(true);
    expect(res.data.plan_code).toBe(planCode);
  });
});

Transfer Recipient + Transfer Tests

describe("Paystack Transfers", () => {
  let recipientCode: string;

  it("should create a transfer recipient", async () => {
    const res = await paystackRequest<{ recipient_code: string }>(
      "/transferrecipient",
      {
        method: "POST",
        body: JSON.stringify({
          type: "nuban",
          name: "Test Recipient",
          account_number: "0000000000",
          bank_code: "058",
          currency: "NGN",
        }),
      }
    );

    expect(res.status).toBe(true);
    expect(res.data.recipient_code).toMatch(/^RCP_/);
    recipientCode = res.data.recipient_code;
  });

  it("should initiate a transfer (test mode)", async () => {
    const res = await paystackRequest("/transfer", {
      method: "POST",
      body: JSON.stringify({
        source: "balance",
        amount: 10000, // ₦100
        recipient: recipientCode,
        reason: "Test transfer",
      }),
    });

    // In test mode, transfers are simulated
    expect(res.status).toBe(true);
  });
});

Webhook Testing

Unit Test for Webhook Signature Validation

import { createHmac } from "crypto";
import { describe, it, expect } from "vitest";

function validateWebhookSignature(
  body: string,
  signature: string,
  secret: string
): boolean {
  const hash = createHmac("sha512", secret).update(body).digest("hex");
  return hash === signature;
}

describe("Webhook Signature Validation", () => {
  const secret = "sk_test_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

  it("should validate a correct signature", () => {
    const body = JSON.stringify({
      event: "charge.success",
      data: { reference: "test_ref_123" },
    });
    const signature = createHmac("sha512", secret).update(body).digest("hex");

    expect(validateWebhookSignature(body, signature, secret)).toBe(true);
  });

  it("should reject an invalid signature", () => {
    const body = JSON.stringify({ event: "charge.success" });
    expect(validateWebhookSignature(body, "invalid_hash", secret)).toBe(false);
  });

  it("should reject a tampered body", () => {
    const body = JSON.stringify({ event: "charge.success" });
    const signature = createHmac("sha512", secret).update(body).digest("hex");
    const tampered = JSON.stringify({ event: "charge.failed" });

    expect(validateWebhookSignature(tampered, signature, secret)).toBe(false);
  });
});

Testing Webhooks Locally

Use Paystack's test mode + a tunnel service:

# 1. Start your local server
npm run dev

# 2. Expose localhost via tunnel (pick one)
npx localtunnel --port 3000
# or
ngrok http 3000

# 3. Set the tunnel URL as your test webhook URL in Paystack Dashboard
#    Dashboard → Settings → API Keys & Webhooks → Test Webhook URL

# 4. Trigger events by completing test transactions
#    Paystack will send webhooks to your tunnel URL

Mock Webhook Handler Test

import { describe, it, expect, vi } from "vitest";
import { createHmac } from "crypto";

// Simulates a POST to your webhook endpoint
async function simulateWebhook(
  handler: (req: Request) => Promise<Response>,
  event: string,
  data: Record<string, unknown>,
  secret: string
) {
  const body = JSON.stringify({ event, data });
  const signature = createHmac("sha512", secret).update(body).digest("hex");

  return handler(
    new Request("http://localhost/api/webhooks/paystack", {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        "x-paystack-signature": signature,
      },
      body,
    })
  );
}

describe("Webhook Handler", () => {
  const secret = "sk_test_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

  it("should process charge.success event", async () => {
    const processPayment = vi.fn();

    // Your actual webhook handler
    async function webhookHandler(req: Request): Promise<Response> {
      const body = await req.text();
      const sig = req.headers.get("x-paystack-signature")!;
      const hash = createHmac("sha512", secret).update(body).digest("hex");

      if (hash !== sig) {
        return new Response("Unauthorized", { status: 401 });
      }

      const { event, data } = JSON.parse(body);
      if (event === "charge.success") {
        processPayment(data);
      }
      return new Response("OK", { status: 200 });
    }

    const res = await simulateWebhook(
      webhookHandler,
      "charge.success",
      { reference: "test_123", amount: 50000, currency: "NGN" },
      secret
    );

    expect(res.status).toBe(200);
    expect(processPayment).toHaveBeenCalledWith(
      expect.objectContaining({ reference: "test_123" })
    );
  });
});

Bank Account Resolution Test

describe("Bank Verification", () => {
  it("should resolve a bank account", async () => {
    const res = await paystackRequest(
      "/bank/resolve?account_number=0000000000&bank_code=058"
    );
    // Test mode may return mock data
    expect(res.status).toBe(true);
  });

  it("should list banks", async () => {
    const res = await paystackRequest("/bank?country=nigeria&perPage=10");
    expect(res.status).toBe(true);
    expect(res.data.length).toBeGreaterThan(0);
    expect(res.data[0]).toHaveProperty("code");
    expect(res.data[0]).toHaveProperty("name");
  });
});

Vitest Configuration

// vitest.config.ts
import { defineConfig } from "vitest/config";

export default defineConfig({
  test: {
    globals: true,
    environment: "node",
    testTimeout: 30_000, // API calls may take time
    setupFiles: ["./tests/setup.ts"],
  },
});

// tests/setup.ts
import { config } from "dotenv";
config({ path: ".env.test" });

if (!process.env.PAYSTACK_SECRET_KEY?.startsWith("sk_test_")) {
  throw new Error(
    "Tests must use test mode keys (sk_test_*). Never run tests with live keys."
  );
}

Checklist Before Going Live

• All tests pass with sk_test_ keys
• Webhook signature validation tested (valid + invalid + tampered)
• Transaction initialize → verify flow tested
• Error responses handled (invalid amount, missing fields, etc.)
• Idempotency: duplicate references handled gracefully
• Switch to sk_live_ / pk_live_ keys in production environment
• Live webhook URL configured in Dashboard
• IP whitelist verified for webhook source (52.31.139.75, 52.49.173.169, 52.214.14.220)