some users provided only their bank name and account number data without providing paystack and cryptocurrency details but the available data/info is not being displayed

The code you provided is ok

NOW
If at least one of the xprofile payment fields data is available do not show any of the $missing_details text and output/display only the available profile data/info.

I tried modifying the code but it wasn’t ok
see modified code something is wrong

 add_action( 'bp_member_header_actions', function () {

	$user_id = bp_displayed_user_id();

	$donation_page_link = add_query_arg(
		array(
			'user_id' => $user_id,
			'nonce'   => wp_create_nonce( 'donate-' . $user_id ),
		),
		get_page_link( 36918 ) // Replace by your donation page link.
	);

	$r = array(
		'id'                => 'donation_link',
		'component'         => 'members',
		'must_be_logged_in' => true,
		'link_text'         => _x( 'Send Money', 'button', 'buddypress' ),
		'link_href'         => esc_url( $donation_page_link ),
	);

	echo bp_get_button( $r );
} );

add_filter( 'the_content', function ( $content ) {

	// Our donation page link.
	if ( ! is_page( 36918 ) || ! isset( $_GET['user_id'] ) || ! $_GET['nonce'] ) {
		return $content;
	}

	$user = get_user_by( 'id', absint( $_GET['user_id'] ) );

	if ( ! $user || ! wp_verify_nonce( $_GET['nonce'], 'donate-' . $user->ID ) ) {
		return $content;
	}

	// Replace field id with your one mandatory for donation. If empty return your message.
	if ( empty( xprofile_get_field_data( 3217, $user->ID ) ) ) {
		return $content . __( 'Bank name has not been provided' );
	}
	if ( empty( xprofile_get_field_data( 3218, $user->ID ) ) ) {
		return $content . __( 'Account number has not been provided' );
	}
    if ( empty( xprofile_get_field_data( 3219, $user->ID ) ) ) {
		return $content . __( 'Account name has not been provided' );
	}
    if ( empty( xprofile_get_field_data( 3220, $user->ID ) ) ) {
		return $content . __( 'Paystack URL has not been provided' );
	}
    if ( empty( xprofile_get_field_data( 4447, $user->ID ) ) ) {
		return $content . __( 'Cryptocurrency name has not been provided' );
	}
    if ( empty( xprofile_get_field_data( 4446, $user->ID ) ) ) {
		return $content . __( 'Cryptocurrency address has not been provided' );
	}

	ob_start();

	// Replace group_id to your group id.
	echo do_shortcode( "[bpsc-user-avatar user_id={$user->ID} group_id=2]" );
	echo do_shortcode( "[bpsc-user-display-name user_id={$user->ID} group_id=2]" );
    echo do_shortcode( "[bp-shortcodes-profile user_id={$user->ID} group_id=2]" );

	$shortcode_content = ob_get_clean();

	return $content . $shortcode_content;
} ); 

thanks but im using legacy template not nouveau template

I think you misunderstood me what im trying to say is while bp rewrites is activated the pages section in buddypress settings is totally disabled so its no longer possible to assign pages for branded login plugin.

BP REWRITES plugin removes the pages setting in buddypress and replaces it with a new slug management section.

Now in this slug management section there are not options for branded login.

You might need to activate the BP rewrite plugin and navigate to buddypress settings.

I just tested it now but branded login page directory is not included in the new URL tab for editing slugs