Is there any minimum amount to be sent in order to earn points?

No, there is no minimum amount limit to earn points. Points will be credited as per the INR amount sent up-to 1 decimal places rounding off to the nearest decimal place

E.g. For every Rs. 200 sent, customer will earn 1 point which is equal to 10 paise. Thus If customer send Rs. 100, he/she will earn 0.5 points = 5 paise