post https://api-approval.tingg.africa/v3/checkout-api/validate-otp
This function will send a one time pin to the customer’s mobile number via S.M.S
| Key | Value Type | Description | Required |
|---|---|---|---|
| merchant_transaction_id | String | Unique Id the merchant raised for the request | TRUE |
| msisdn | String | The mobile number the customer will use to make a payment. | TRUE |