WPCS - WordPress Currency Switcher

WPML:

• open functions.php of your current wp theme
• drop there next PHP code:
  
  add_filter('wp_head', function() { $lang = ICL_LANGUAGE_CODE; global $WPCS; switch ($lang) { case 'bg': $WPCS->storage->set_val('wpcs_current_currency', 'BGN'); break; case 'en': $WPCS->storage->set_val('wpcs_current_currency', 'EUR'); break; default: $WPCS->storage->set_val('wpcs_current_currency', 'USD'); break; } });

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  add_filter('wp_head', function() {     $lang = ICL_LANGUAGE_CODE;     global $WPCS;     switch ($lang)     {         case 'bg':             $WPCS->storage->set_val('wpcs_current_currency', 'BGN');             break;         case 'en':             $WPCS->storage->set_val('wpcs_current_currency', 'EUR');             break;         default:             $WPCS->storage->set_val('wpcs_current_currency', 'USD');             break;     } });

• See WPML docs about languages codes

Polylang:

• open functions.php of your current wp theme
• drop there next PHP code:
  
  add_filter('wp_head', function() { $lang = get_locale(); global $WPCS; switch ($lang) { case 'bg_BG': $WPCS->storage->set_val('wpcs_current_currency', 'BGN'); break; case 'en_GB': $WPCS->storage->set_val('wpcs_current_currency', 'EUR'); break; default: $WPCS->storage->set_val('wpcs_current_currency', 'USD'); break; } });

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  add_filter('wp_head', function() {     $lang = get_locale();     global $WPCS;     switch ($lang)     {         case 'bg_BG':             $WPCS->storage->set_val('wpcs_current_currency', 'BGN');             break;         case 'en_GB':             $WPCS->storage->set_val('wpcs_current_currency', 'EUR');             break;         default:             $WPCS->storage->set_val('wpcs_current_currency', 'USD');             break;     } });

• https://wordpress.org/support/topic/switch-currency-with-language-change-polylang/
• See Polylang docs about languages codes

GTranslate:

• open functions.php of your current wp theme
• drop there next PHP code:
  
  add_filter('wp_head', function() { $lang = isset($_SERVER['HTTP_X_GT_LANG']) ? $_SERVER['HTTP_X_GT_LANG'] : ''; global $WPCS; switch ($lang) { case 'bg_BG': $WPCS->storage->set_val('wpcs_current_currency', 'BGN'); break; case 'en_GB': $WPCS->storage->set_val('wpcs_current_currency', 'EUR'); break; default: $WPCS->storage->set_val('wpcs_current_currency', 'USD'); break; } });

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  add_filter('wp_head', function() {     $lang = isset($_SERVER['HTTP_X_GT_LANG']) ? $_SERVER['HTTP_X_GT_LANG'] : '';     global $WPCS;     switch ($lang)     {         case 'bg_BG':             $WPCS->storage->set_val('wpcs_current_currency', 'BGN');             break;         case 'en_GB':             $WPCS->storage->set_val('wpcs_current_currency', 'EUR');             break;         default:             $WPCS->storage->set_val('wpcs_current_currency', 'USD');             break;     } });

• https://wordpress.org/plugins/gtranslate/