You will find the WooCommerce Partial Payments settings on your WordPress admin area navigating to the GamiPress menu -> Settings -> Add-ons tab.

Amount Field Type
The points amount field type. Available options:
Input: A numeric input field where users can type the desired amount.
Slider: A slider field where users can choose the desired amount.
Fixed: A fixed amount that users won’t be able to change. The points amount will be the points type’s “Initial Amount” field value.

Amount Field Step
The points amount field step. It’s used to adjust the granularity of the amount field. Examples:
A step of 5 will allow values multiple of 5: 5, 10, 15, etc.
A step of 10 will allow values multiple of 10: 10, 20, 30, etc.
A step of 1 will allow any value.

Maximum Discount Per Cart
The maximum discount allowed in a single purchase.

Type Of Maximum Discount Per Cart
The type of maximum discount allowed in a single purchase. Available options:
Flat: The maximum discount allowed will be limited by a flat amount. If you enter 10 then the maximum discount will be $10.
Percentage: The maximum discount allowed will be limited by a percentage of the purchase subtotal. If you enter 10 then the maximum discount will be 10% of the purchase subtotal.