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The UBN BaaS Postman collection gives you a ready-to-use set of API requests so you can explore every endpoint, test your credentials, and understand request and response shapes without writing a single line of code.

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What Is Postman?

Postman is a free desktop application that lets you make API calls through a visual interface. Think of it as a remote control for the API: you pick the endpoint, fill in the parameters, press send, and see the response. It is the fastest way to verify that your API key works, understand what a response looks like, and manually test edge cases before you build them into your application. Download it free at postman.com.

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Getting Started

1

Download and install Postman

Go to postman.com/downloads and download the version for your operating system (Windows, macOS, or Linux). Create a free Postman account when prompted. You need an account to use the environment and collection features.
2

Import the UBN BaaS collection

Download the collection JSON file from the repository:
In Postman:
  1. Click Import in the top-left corner.
  2. Choose File and select the downloaded JSON file.
  3. Click Import. The collection appears in your left sidebar under Collections.
3

Create your Postman environment

The collection uses environment variables so you do not have to paste your credentials into every request. Set up an environment to hold your values.In Postman:
  1. Click the Environments icon in the left sidebar (looks like a slider).
  2. Click + to create a new environment. Name it UBN BaaS Sandbox.
  3. Add the following variables:
  1. Click Save.
  2. In the top-right corner of Postman, select UBN BaaS Sandbox from the environment dropdown so the collection uses these values.
Treat the Initial Value column as the value visible to anyone with access to your Postman workspace. For credentials, use Current Value instead. It is local to your machine and not synced to Postman’s cloud. Click the eye icon next to each variable to switch between columns.
4

Verify connectivity with a health check

Expand the collection in the left sidebar. Open the Health folder and click GET Health Check.Press Send. You should receive:
If you see this response, your Postman environment is configured correctly and the API is reachable.
5

Follow the collection folder structure

The collection is organised into folders that match the documentation sections. Work through them in order when first exploring the API:
  1. Health: connectivity check
  2. Auth: partner registration and email verification
  3. KYB: document submission
  4. API Keys: generate, rotate, revoke
  5. KYC: BVN, NIN, and CAC verification
  6. Accounts: create and query virtual accounts
  7. Payments: account enquiry and transfers
  8. Collections: receive inbound payments
  9. Webhooks: register endpoints, view delivery history

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Environment Variables Reference

When you switch to production, create a second Postman environment called UBN BaaS Production with base_url set to https://api.onecluster.co and your production credentials. Switch between environments using the dropdown in the top-right corner. No changes to the requests themselves are needed.

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Automatic Headers

The collection includes pre-request scripts that run automatically before each request is sent. You do not need to set these headers manually:

X-Correlation-ID

A unique identifier generated for every request. Postman sets this automatically using a UUID. When you report an issue to support, copy this value from the request headers tab. It is how we find your specific request in our logs.

Content-Type

Set to application/json on all POST and PATCH requests. The pre-request script handles this so you only need to fill in the request body.

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Request Signing for Payments and KYC

Payment and KYC endpoints require an X-Signature header: a cryptographic signature that proves the request body has not been modified in transit.
The collection includes a pre-request script that computes the HMAC-SHA256 signature automatically using the signing_secret variable in your environment. You do not need to compute it manually. Just set the signing_secret variable correctly and Postman handles the rest.
The script works as follows:
If you later implement signing in your own application, this is the exact algorithm to replicate. See API Reference: Authentication for a full explanation.

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Tips for Effective Testing

Use the Postman Console (View → Postman Console, or Alt+Cmd+C on Mac) to see exactly what request was sent, including all headers. Invaluable when debugging signature issues: you can see the exact body that was signed alongside the resulting header.
Right-click any request and choose Duplicate to create a copy for testing variations. For example, duplicate the transfer request to have one for testing a successful transfer and one for testing an invalid account number without losing your working configuration.
Use the Tests tab in Postman to write assertions on the response. The collection includes example tests for common checks (status code is 200, response contains a reference field). You can run the entire collection as a test suite using Collection Runner to verify all endpoints pass after any change.