it will count as "extra" payment.

based on this installment plan by merchant,

if next month (june) statement just installment and no other spend, and u pay full 2.8k, then, the bank will still take 466.67 as payment, and 2333.33 will be carry fwd to july.

for july statement, if u got spend, total example 2k, statement should be 2466.67
but it will deduct the carry fwd 2333.33 so the statement will be just 133.34
next statement after that, 466.67 will be charge again as usual (plus ur other spending, if got)