Accreditation is used on Survey Jury to refer to whether or not a paid online survey holds any "stamps of approval" such as AMSRO, ESOMAR, BBB membership.
AMSRO is the Association of Market and Social Research Organisations. Individuals, not companies, hold membership with AMSRO, and so if a paid survey website lists AMSRO membership on its website it means one or more of its staff are members. AMSRO membership, like AMSRS membership, can mean a higher level of professionalism.
ESOMAR is an organisation that claims its mission is to "advance and elevate market research worldwide." Individual membership to ESOMAR, like AMSRS, is intended to broaden one's understanding of market research. It's definitely a "stamp of approval" worth looking out for if you want to get paid for surveys in Australia, but our opinion is that it's not a guarantee that one paid survey website is better than another.
BBB (Better Business Bureau)
BBB letter grades represent the BBB's opinion of the business. The BBB grade is based on BBB file information about the business. In some cases, a business' grade may be lowered if the BBB does not have sufficient information about the business despite BBB requests for that information from the business.
BBB assigns letter grades from A+ (highest) to F (lowest). In some cases, BBB will not grade the business (indicated by an NR, or "No Rating”) for reasons that include insufficient information about a business or ongoing review/update of the business' file.
BBB Business Reviews generally explain the most significant factors that raised or lowered a business' grade.
BBB grades are not a guarantee of a business' reliability or performance, and BBB recommends that consumers consider a business' grade in addition to all other available information about the business.