# Optional load testing

Load testing is optional. Postman meets internal load test standards and has successfully supported multiple nationwide campaigns without any issues.

<mark style="color:$danger;">**The purpose of load testing is to evaluate your system's capacity and performance when calling Postman's APIs, not to verify SMS delivery to recipients.**</mark>

***

**Load Test Environment**

All load testing must be conducted in the dedicated load test environment. Do **not** conduct load tests on the production or test environments.

|              | URL                                      |
| ------------ | ---------------------------------------- |
| Admin Portal | <https://loadtest.postman.gov.sg>        |
| API Base URL | <https://loadtest.postman.gov.sg/api/v2> |

***

**How Load Testing Works**

SMS messages sent from the load test environment are processed only at the aggregator level and **do not reach the telco level**. This means:

* Messages will **not** be delivered to actual mobile phones
* Message status will remain `Pending` on Postman, not `success`
* Messages sent in the load test environment are **not charged**

The load test environment is designed solely for testing your system's capabilities under load conditions.

***

**Booking a Load Test**

You must book a time slot before conducting any load test. Submit your booking at least **seven days in advance**. Otherwise, the Postman team will be unable to provide any support.

**Step 1: Complete the booking form**

Submit your booking request via the [load test booking form](https://cal.gov.sg/n2g21zn65d6nr2pd80cd051p).

<mark style="color:red;">**Do not perform load tests outside your booked time slot. Conducting load tests during unapproved timeframes can affect other scheduled activities and hinder accurate test results.**</mark>

***

**Do Not Use the Test or Production Environments for Load Testing**

The test environment (`test.postman.gov.sg`) is for functional integration testing only, not load testing.

* The test site has a CSV file limit of **20 rows** to prevent load testing
* Do not use "fake" numbers (e.g. `6590000000`, `6599999999`, `6588888888`) on the test or production environments, as these are real numbers owned by members of the public
* Failed delivery attempts from fake numbers still incur charges and overload the telco queue
* Non-compliance will be reported to your agency's PIC and CIO


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