There are different options for startups in need of extra money, each with their own benefits and drawbacks. Depending on the company’s individual situation, some options might be preferable to others.

An overdraft is an amount of additional funds which you have access to if you would like to spend more than the balance in your account. One of the positives of using a credit card overdraft is that it is flexible repayment - you can pay back as much as you can when you can as long as the overdraft remains within the limits.
However, the amount available to companies through this method is fairly limited. Additionally, you will need to repay interest on the overdraft balance until it is fully repaid. These interest rates can work out as very expensive. In fact, sometimes overdrafts for credit cards, if unauthorized can be some of the most expensive forms of borrowing amongst all financial products, even more, costly than the 400% or 600% APRs charged for high cost loans, such as payday loans.
Source: https://www.entrepreneurshipsecret.com/need-extra-money/