Note: These countries have been selected based on the system PCST uses to determine membership fees.
| Country |
| Afghanistan |
| Albania |
| Algeria |
| Angola |
| Antigua and Barbuda |
| Argentina |
| Armenia |
| Azerbaijan |
| Bahamas, The |
| Bahrain |
| Bangladesh |
| Barbados |
| Belarus |
| Belize |
| Benin |
| Bhutan |
| Bolivia |
| Bosnia and Herzegovina |
| Botswana |
| Brazil |
| Bulgaria |
| Burkina Faso |
| Burma |
| Burundi |
| Cambodia |
| Cameroon |
| Cape Verde |
| Central African Republic |
| Chad |
| Chile |
| China |
| Colombia |
| Comoros |
| Congo, Democratic Republic of the |
| Congo, Republic of the |
| Costa Rica |
| Cote d’Ivoire |
| Croatia |
| Cuba |
| Czech Republic |
| Djibouti |
| Dominica |
| Dominican Republic |
| East Timor |
| Ecuador |
| Egypt |
| El Salvador |
| Equatorial Guinea |
| Eritrea |
| Estonia |
| Ethiopia |
| Fiji |
| Gabon |
| Gambia, The |
| Georgia |
| Ghana |
| Greece |
| Grenada |
| Guatemala |
| Guinea |
| Guinea-Bissau |
| Guyana |
| Haiti |
| Honduras |
| Hungary |
| India |
| Indonesia |
| Iran |
| Iraq |
| Jamaica |
| Jordan |
| Kazakhstan |
| Kenya |
| Kiribati |
| Korea, South |
| Kosovo |
| Kyrgyzstan |
| Laos |
| Latvia |
| Lebanon |
| Lesotho |
| Liberia |
| Libya |
| Lithuania |
| Macedonia, Republic of |
| Madagascar |
| Malawi |
| Malaysia |
| Maldives |
| Mali |
| Malta |
| Mauritania |
| Mauritius |
| Mexico |
| Moldova |
| Mongolia |
| Montenegro |
| Morocco |
| Mozambique |
| Namibia |
| Nepal |
| Nicaragua |
| Niger |
| Nigeria |
| Pakistan |
| Panama |
| Papua New Guinea |
| Paraguay |
| Peru |
| Philippines |
| Poland |
| Portugal |
| Romania |
| Russia |
| Rwanda |
| Saint Kitts and Nevis |
| Saint Lucia |
| Saint Vincent and the Grenadines |
| Samoa |
| Senegal |
| Serbia |
| Seychelles |
| Sierra Leone |
| Slovakia |
| Slovenia |
| Solomon Islands |
| South Africa |
| South Sudan |
| Sri Lanka |
| Sudan |
| Suriname |
| Swaziland |
| Syria |
| Taiwan |
| Tajikistan |
| Tanzania |
| Thailand |
| Togo |
| Tonga |
| Trinidad and Tobago |
| Tunisia |
| Turkey |
| Turkmenistan |
| Tuvalu |
| Uganda |
| Ukraine |
| Uruguay |
| Uzbekistan |
| Vanuatu |
| Venezuela |
| Vietnam |
| Yemen |
| Zambia |
| Zimbabwe |