API Reference

Submit W-8IMY tax form

post
https://{environment}.masspay.io/{VERSION}/payout//tax/interview/w8imy

This POST endpoint is used to submit a W-8IMY tax form (for foreign intermediaries, foreign flow-through entities, or certain U.S. branches) for a specific user identified by their user_token. Basic information (name, address, phone) is retrieved from the user's existing profile.

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Path Params
string
required
Body Params
string
length ≤ 80

Disregarded entity name (if applicable)

string
enum
required

Chapter 3 status for withholding

string
enum
required

Chapter 4 (FATCA) status

string
enum

Type of US TIN

Allowed:
string

US Taxpayer Identification Number

string
length ≤ 19

Global Intermediary Identification Number

string
length ≤ 25

Foreign Tax Identification Number

boolean
Defaults to false

Check if FTIN is not legally required

string
length ≤ 50

Reference number for your records

qualified_intermediary
object
disregarded_entity_branch
object
certification
object
required
Responses

404

Not Found

Updated 16 days ago

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application/json

Updated 16 days ago

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