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Where to find your keys

Open the Developer section of the EximPe Dashboard. You get:
  • Client ID
  • Client Secret
Sandbox keys appear as soon as you sign up. Production keys appear once your account is activated.
Sandbox and production keys are not interchangeable, and neither are the two hosts. Going live means changing both.

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Environments

Build and test against sandbox. Nothing there moves real money, and you can simulate an incoming transfer instead of making one.

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Headers on every call

X-API-Version is not optional. Leave it out and the call fails with a 401 whose message talks about credentials — which sends you hunting through your keys instead of your headers.
Keep your Client Secret on your server. It is not safe in a browser or a mobile app.

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If you are a PSP

You call the API on behalf of the businesses you onboard, so there is one extra step before your first call.
1

Add the merchant

In sandbox a dummy merchant is created for you at signup. Otherwise see Adding Merchants.
2

Wait for activation

Sandbox activates instantly. In production it follows due diligence under RBI rules.
3

Use their merchant ID

Once active you get a merchant_id. Send it as X-Merchant-ID on every call you make for that sub-merchant.
A PSP cannot collect for a sub-merchant until that sub-merchant is active.