Plugin/Field/FieldType/PaymentMethod/generateSampleValue is static, but uses $this

Index Out of Bounds:

$values[array_rand($values)]:
This method will always generate a valid index within the bounds of the array.

$values[rand(0, count($values))]:
This can potentially generate an index equal to count($values), which is out of bounds and will cause an error.
Performance and Readability:

$values[array_rand($values)]:
This method is more readable and clearly conveys the intent of selecting a random element from the array.
$values[rand(0, count($values))]:
Even if corrected to $values[rand(0, count($values) - 1)], it is less readable and more error-prone.
Correct and Safe Usage:
Preferred Method: $values[array_rand($values)]
This ensures that a valid index is always selected, preventing any potential index out-of-bounds errors.

Please correct me if I am wrong.

ok the patch is committed to HEAD