"Present both DOIs and URLs as hyperlinks (i.e., beginning with 'http://' or 'https://')."
"The preferred format of the DOI has changed over time; although older works use previous formats (e.g., "http://dx.doi.org/" or "doi:" or "DOI:" before the DOI number), in your reference list, standardize DOIs into the current preferred format for all entries": https://doi.org/<DOI number>.
Examples:
Convert DOI: 10.1017/S0008423910000983 into https://doi.org/10.1017/S0008423910000983.
Convert http://dx.doi.org/10.1037/a0040251 into https://doi.org/10.1037/a0040251.
"Do not add a period after the DOI or URL."
(Publication Manual of the American Psychological Association, 2020, pp. 299–300)