DB:

1. user:

   1. id (unique)
   2. email
   3. phone
   4. username (unique)
   5. password
   6. token

2. card:

   1. id (unique)
   2. owner_id
   3. is_default
   4. name
   5. card_token (unique)
   6. balance
   7. currency

3. transaction:

   1. id (unique)
   2. date_time
   3. from_card
   4. to_card
   5. from_user
   6. to_user
   7. amount
   8. currency

4. donation:

   1. id (unique)
   2. donation_token (unique) (8 or 16 char)
   3. owner_id
   4. receiver_card_id
   5. title
   6. description

API:

1. user_controller:

   1. register/{username}/{email}/{phone}/{password}
   2. login/{username}/{password}
   3. change_phone/{token}/{new_phone}

2. card_controller:

   1. add/{token}/{name}/{currency}
   2. remove/{token}/{card_token}
   3. cards/{token}
   4. rename/{token}/{card_token}/{new_name}
   5. set_default/{token}/{card_token}
   6. get_card_data/{token}/{card_token}

3. transaction_controller:

   1. send_by_card/{token}/{from_card}/{to_card}/{amount}/
   2. send_by_username/{token}/{from_username}/{to_username}/{amount}
   3. transactions/{token}

4. donation_controller:

   1. create_donation/{token}/{receiver_card_id}/{title}/{description}
   2. donations/{token}
   3. donation_by_token/{donation_token}
   4. donate/{token}/{from_card}/{donation_token}/{amount}

Frontend

1. login/register menu
2. main_menu:
   1. settings
   2. profile
   3. list_of_cards
   4. send_money
   5. donations
      1. create_donate
      2. find
      3. donate