INCRBY key increment
Increments the number stored at key by increment. If the key does not exist, it is set to 0 before performing the operation. An error is returned if the key contains a value of the wrong type or contains a string that can not be represented as integer. This operation is limited to 64 bit signed integers.
See INCR for extra information on increment/decrement operations.
Integer reply: the value of key after the increment
"OK" redis> INCRBY mykey 5 (integer) 15
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https://redis.io/commands/incrby