ceil($amount): This ensures that if the amount has a decimal (e.g., 123.45), it will round up to the next integer (e.g., 124). If the amount is already an integer (e.g., 123), it remains unchanged. Convert to Kobo: After rounding up, the amount is multiplied by 100 to convert it to kobo (or cents), as required by Paystack.

ceil($amount): This ensures that if the amount has a decimal (e.g., 123.45), it will round up to the next integer (e.g., 124). If the amount is already an integer (e.g., 123), it remains unchanged. Convert to Kobo: After rounding up, the amount is multiplied by 100 to convert it to kobo (or cents), as required by Paystack.