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Thanks for reporting. I was able to confirm the limit you mentioned.
I will forward this to our developers so they can check and implement changes on this. I'm not exactly sure why it's limited to 52 currently but if there's any way to increase it to something higher, our developers should know and hopefully implement it as soon as possible.
We will let you know once this is implemented.
"Number of payments" is restricted by gateway APIs to a maximum of 52. I am sorry to say that we cannot increase this value because of that.