And what are the specific documents for the Colombian visa application?

Resolution 5477 of 2022 of the Ministry of Foreign Affairs, in its Article 68, establishes the following specific requirements in relation to the M visa: 

1. Document accrediting the de facto marital union: public deed, court order, conciliation act or certificate of validity issued within the last three months, whose formalisation is more than one year old at the time of the application.
2. Document valid under the law of the country where the union was declared, with the formalities required for foreign documents, when the application is submitted to consular offices.
3. Letter signed by the Colombian partner requesting the visa, declaring stable, unique and persevering cohabitation, as well as the commitment to inform of any change, with a simple copy of the citizenship card and contact details.
4. Possibility for the visa authority to require additional evidence or to call for a face-to-face, virtual or telephone interview.
5. Special power of attorney granted to the foreigner, with diligence of recognition of signature and content before a notary or Colombian consul.
6. Certificate of migratory movements of the foreign applicant and his or her Colombian partner, issued by Migración Colombia.