# Card Operations

{% columns %}
{% column %}
{% content-ref url="card-operations/process-a-card-sale" %}
[process-a-card-sale](https://docs.number.tech/api-reference/rest-api/card-operations/process-a-card-sale)
{% endcontent-ref %}

{% content-ref url="card-operations/void-a-transaction" %}
[void-a-transaction](https://docs.number.tech/api-reference/rest-api/card-operations/void-a-transaction)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
{% content-ref url="card-operations/process-a-refund" %}
[process-a-refund](https://docs.number.tech/api-reference/rest-api/card-operations/process-a-refund)
{% endcontent-ref %}

{% content-ref url="card-operations/authentication" %}
[authentication](https://docs.number.tech/api-reference/rest-api/card-operations/authentication)
{% endcontent-ref %}
{% endcolumn %}
{% endcolumns %}