If you've enabled auto recharge and your account balance drops below the threshold value you've set, Plivo will charge to the credit card associated with your account the recharge amount you've set. If the balance is well below the threshold we may need to charge the recharge amount multiple times until the account balance is equal to or above the defined threshold value.
Here’s an example of how this works. Say you had a balance of $100, and you set the threshold value to $100 and the auto recharge amount at $20. If the account balance went down to $10 due to a one-shot spend of $90, the account would be auto-recharged $20 five times to bring the account balance above the threshold value of $100.
If the first recharge attempt fails, Plivo will wait and try to charge the card again when the balance falls to 75% of the threshold balance. If that recharge attempt fails again, we'll try again when the balance reaches 50% and 25% of the threshold value defined, and when it reaches zero. If we're still unsuccessful and you have a zero or negative balance, you will no longer be able to use any Plivo functions.