Is it obligatory for the fasting person to make only one supplication, or is it permissible for him to supplicate for himself and for others before breaking the fast, hoping for an answered supplication?

Summary: The fasting person's supplication is answered while they are fasting until they break their fast, and the answer is confirmed at the time of breaking fast. It appears that the word "دعوة" (da'wah - supplication/prayer) here does not refer to a single supplication, but rather to supplication in general during this state.