EMAIL_TEMPLATE - how it works

an interesting feature of APEX 18.2 (and before...) is the EMAIL_TEMPLATE; it can be found under "Shared components" --> "other components"

The Email_template consists of 2 parts:

Part 1) The template details
divided into:
- header
- body
- footer
with HTML code content.

By means of a smart click (right hand side region) using "Sample Templates"
--> Get started by loading sample email Templates...
- you can load the HTML code data for the generation of an invoice... :

The hashtags like  #CUSTOMER_NAME# are substitions we know from other places within APEX.

Once we have defined the Email_template and adjusted the HTML for formatting we like to use it.... How ?

Part 2) pl/sql procedure

On the template_details page (as above) we will find a TAB called: "Sample API Usage" which shows the pl/sql we have to use to map the fields from a page to the hashtag substitions:

begin
    apex_mail.send (
        p_to                 => email_address_of_user,
        p_template_static_id => 'EXAMPLE01',
        p_placeholders       => '{' ||
        '    "CUSTOMER_NAME":'           || apex_json.stringify( :P1_CUST_NAME ) ||
        '   ,"ITEMS_ORDERED":'           || apex_json.stringify( :P1_ITEMS_ORD ) ||
        '   ,"MY_APPLICATION_LINK":'     || apex_json.stringify( some_value ) ||
        '   ,"ORDER_DATE":'              || apex_json.stringify( some_value ) ||
        '   ,"ORDER_NUMBER":'            || apex_json.stringify( some_value ) ||
        '   ,"ORDER_TOTAL":'             || apex_json.stringify( some_value ) ||
        '   ,"ORDER_URL":'               || apex_json.stringify( some_value ) ||
        '   ,"SHIPPING_ADDRESS_LINE_1":' || apex_json.stringify( some_value ) ||
        '   ,"SHIPPING_ADDRESS_LINE_2":' || apex_json.stringify( some_value ) ||
        '   ,"SHIP_TO":'                 || apex_json.stringify( some_value ) ||
        '}' );
end;

You just have to apply your fields from the page to "some_value".... as above.

So on your page you have to create a region of type pl/sql and insert above code... Create a Button and run the process by means of clicking the button.

The output is an HTML formatted email.

I did it even in way: The customer enters his data and clicks on "CREATE" (order or s.th.) and the data is stored in the database AND in parallel an order confirmation - email is sent to the customer.

that's it!