> ## Documentation Index
> Fetch the complete documentation index at: https://docs.seam.co/llms.txt
> Use this file to discover all available pages before exploring further.

# Encoder Simulations

> Use the encoder simulation endpoints to make the next credential encode or scan succeed or fail, so you can test card encoder flows in a sandbox.

## Endpoints

[**`/acs/encoders/simulate/next_credential_encode_will_fail`**](./next_credential_encode_will_fail)

Simulates that the next attempt to encode a [credential](/low-level-apis/access-systems/managing-credentials) using the specified [encoder](/low-level-apis/access-systems/working-with-card-encoders-and-scanners) will fail. You can only perform this action within a [sandbox workspace](/core-concepts/workspaces#sandbox-workspaces).

[**`/acs/encoders/simulate/next_credential_encode_will_succeed`**](./next_credential_encode_will_succeed)

Simulates that the next attempt to encode a [credential](/low-level-apis/access-systems/managing-credentials) using the specified [encoder](/low-level-apis/access-systems/working-with-card-encoders-and-scanners) will succeed. You can only perform this action within a [sandbox workspace](/core-concepts/workspaces#sandbox-workspaces).

[**`/acs/encoders/simulate/next_credential_scan_will_fail`**](./next_credential_scan_will_fail)

Simulates that the next attempt to scan a [credential](/low-level-apis/access-systems/managing-credentials) using the specified [encoder](/low-level-apis/access-systems/working-with-card-encoders-and-scanners) will fail. You can only perform this action within a [sandbox workspace](/core-concepts/workspaces#sandbox-workspaces).

[**`/acs/encoders/simulate/next_credential_scan_will_succeed`**](./next_credential_scan_will_succeed)

Simulates that the next attempt to scan a [credential](/low-level-apis/access-systems/managing-credentials) using the specified [encoder](/low-level-apis/access-systems/working-with-card-encoders-and-scanners) will succeed. You can only perform this action within a [sandbox workspace](/core-concepts/workspaces#sandbox-workspaces).